Product Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)
Current Rating: 4.96 out of 5 stars
Votes & Reviews: 95 vote(s) and 988 user reviews.
Reviewed by Railrunner: 
I have been using Amsoil products in my vehicles and motorized equipment for many years and relay on its quality. As a "gearhead", I know how important using quality motor oils and greases are to machinery. They are my first choice for lubrication fluids.
Reviewed by K-Mac:
I only use American AMSOIL in all my vehicles. For this one, I use it in my 2005 Honda Fit 1500cc..
Reviewed by K-Mac:
I only use American AMSOIL in all my vehicles. For this one, I use it in my 2016 Nissan Caravan NV350.
Reviewed by Jeff:
I run Amsoil oil and filter in my Yukon Denali 15,000 miles between changes. Just reset the change oil message at 7500. Doing this for years with several GMC Yukon's. At 250,000 plus miles no oil burn at all. Very impressed with not having to go under the car twice as much.
Reviewed by Ricky:
Awesome cold start protection, and anti-wear lube, simply the best
Reviewed by Mustang Larry:
So far all is good.
Reviewed by Mustang Larry:
Why is it when I change my oil does my mileage drop by 2mpg. For the first 400 miles 1 1/2 to 2 mpg less then it creeps back up.
Reviewed by Ron the Tyrolian:
I have relied on Amsoil products for years to protect my engines and it has done exactly that.
Reviewed by SamLac:
I started using AMSoil in the mid 80s while in Alaska. Cold extreme make lubrication very critical. At minus 40, most petroleum lubes won't even drip off the dip stick and when started cold you can hear every bearing in the engine as there is little or no lube flowing. No so with my AMSoil.
Reviewed by Jeff:
I've been running 5W30 Signature Series in my 2002 Tacoma since putting it on the road in 2016 with 116,000 miles on the engine. I have since had Oil Analyzers (Amsoil, Inc.) test three samples from the truck so far, and have yet to have the oil last more than 13K miles before being told it's time for it to be changed. So much for the 25,000 miles/1 year claim...
Reviewed by Grizz:
I have 2 vehicles that have had this oil in them (changed every 15,000mi) since I bought them new. They both have mileage approaching 250,000, and they run like BRAND NEW. My newest vehicle is a 2017 Subie Forester Turbo so it gets Signature 5W-30 every 10,000 miles, and I'm sure it will see 200k and beyond.
Reviewed by GF1563:
Love the extended oil change intervals and my fuel mileage increased slightly, which leads me to believe it must be lubricating everything very well.
Reviewed by Pat:
It's great year round hot or cold
Reviewed by Don:
Several years ago I switched to Amsoil in my GMC Yukon. I was very impressed with what the Signature Series 5w-30 Motor Oil looked like after the first oil change. With all the oils and products that Amsoil offers, I have since switched everything I own over to Amsoil. Even my lawnmowers.
Reviewed by dhgguy:
Used in my F150 exclusively. Excellent oil & filter.
Would not use anything else.
Reviewed by Ronv:
I have used Amsoil for 30 years and wouldn't think of using any other oil.
Reviewed by Mister nice:
Love that you don't have to change oil as offer as regular oil. Is is a little high. Hey but you get what you pay for.
Reviewed by Henry:
I use Amsoil exclusively
Reviewed by Jblev77:
#1 for 3.5L ecoboost
Reviewed by Ed:
I like being about to change oil at any time between 5-10k and not have to worry about weather or not the oil is doing it job !!!
Reviewed by RebelnOhio:
I have been using Amsoil for over 15 years and have never had a problem, it's a well proven product that I trust in all of my cars for work and for pleasure. I will will continue to use Amsoil and benefit from it's proven results! I own a Livery/Limo Service and I drive about 40-50K miles a year on various cars and I believe Amsoil is the best Oil for all of my vehicles. With the long 15k Mile change intervals it is a money saving gem and your engine benefits 100%. I recommend there products highly!
Reviewed by KENT:
I've used this brand and series in my Dodge Ram 4.7 v-8 since I acquired it at 90,000 miles. I've driven another 70,000 miles since and the engine is stronger than it's ever been! I expect to drive this truck until at least 300K miles because of the Amsoil Signagture Series Synthetic brand motor oil. I won't use anything else!
Reviewed by KK:
I use Amsoil on my SUV and love it!
Reviewed by Tom:
I use ansoil on all of my trucks, motorcycles, ATVs. This oil I use on 2017 Hemi 2500. It cannot be beat.
Reviewed by G:
Instant satisfaction, after the first start up i could already hear and feel things running smoother.
Reviewed by Redtundra8:
This is the best oil money can buy in my opinion. I use this in all my vehicles and have for the last 12 years. Love only having to change the oil once a year. I highly recommend this product.
Reviewed by Pat:
Bestboil products on the market by far. I run it in all my vehicles
Reviewed by Billy G:
I have used Amsoil products for many years in all of my vehicles and small engines. I have never had an issues. I recommend Amsoil even though it is not the cheapest but the delivery is very prompt.
Reviewed by Wingsprnt:
Not sure about the oW-20 weight here in Florida, but that is what Honda calls for.
Reviewed by Greg:
Always met my expectations.
Reviewed by MatsB:
Using Amsoil in all of my family's cars. Using Signature series in cars that drive over 12,000 miles per year, and XL series in cars that drive less than 12,000 miles.
Sent a 27,000 mile sample for testing to a independent lab, and they recommended 30,000 miles next time based on the excellent results.
Also using Amsoil in all lawn equipment and for a standby generator.
Reviewed by Robert Long:
Great product gives better fuel mileage and cleaner oil after changes
Reviewed by Tim:
I've been using Amsoil since the 1980s in everything with an engine. And have bragged about it's benefits to anyone who'd listen.
Reviewed by Rob:
I get better mileage with Amsoil
I run my 4x4 very hard and Amsoil is doing a great job of keeping it running strong
Reviewed by Elvis of Aragorn:
My 2004 Silverado (5.3L V8) has had a steady diet of Amsoil since its second oil change. I have stuck to the 10,000 mile interval, using Amsoil Ea filters & Signature Oil. She's about to roll over the 200,000 mile mark, and I have had no engine issues. I use Amsoil Signature Synthetic Oil in all of my vehicles, and plan on keeping it that way.
Reviewed by Pinto:
I'm city driving in a 4x4 Ford van and after my last oil change the oil was still in great condition after 15,000 miles. just used the cleaning solution so lets see how this improves engine longevity. really happy with all th products I have received.
Reviewed by S2kadi:
I use Amsoil Signature Series in both of my cars that are susceptible to burning oil. The 10W30 goes into my Honda S2000 and works great! Amsoil is the only oil I use in my motors and gearboxes, after trying out several different brands, I have found their quality to be of the best.
Reviewed by pro4100:
I use it in my Subie Forester and my silverado 1500. no problems ever!
Reviewed by Quick charge water:
Yeah like to 25,000 my old changed
Reviewed by Beast:
I will never use conventional again. 10K mile Oil changes, or once a year. You cant beat the quality and value of this product. No dealer or mechanic can ever persuade my to change every 3k miles again!. Get you some!
Reviewed by ScoobyVTEC:
Bought Amsoil for all of my cars so I wouldn't have to change the oil so frequently and for the protection it gives all of the internal moving parts. I've noticed an increase in MPG and smoothness when I drive.
2017 Civic Type R
2012 Pilot Touring AWD
1998 Civic EX
Reviewed by Chuck:
I have used Amsoil for 25 years in all my vehicles. I change my oil and filter once a year, which is about 15000 miles. It is a time and money saver.
Reviewed by Garry:
Have used AMSOIL for 2003 SVT Focus and 2011 Saab 9 3. Focus has 336,000 miles and Saab has 115,000.
Reviewed by Lungbuster:
I use this in my 2001 f150. I currently am at 246,000 miles and it is still a strong motor and have not broke down this motor yet for internal work or repairs.
Reviewed by JJ:
1995 Ford F 150 280000 mi
2005 Ford Escape 190000 mi both show no decrease in power.
Reviewed by Dan the Nan:
I have used Amsoil since 1980 in all my cars and small engines. All have worked like new and nothing I own using Amsoul has ever had an engine related issue to to excessive wear or reliability.
Reviewed by Jeff:
I have used this oil for 4 years now in my 2005 F150. Each December I change the oil myself and send samples to Blackstone Labs for analysis. Each time it has come back, saying I can extend my oil changes another 5K+ miles because the TBN is great. Has always been over 2. The most I have driven in any 1 year period before changing oil was 14K miles. I'm impressed.
Reviewed by JCS:
I will be using this in my 2017 Chevy Silverado 4x4 for as long as I own it! Great product!
Reviewed by Rick:
Started using over fifteen years ago. First in my motorhome. Was told it could increase my MPG. It did by 2 miles to the gallon. In a motor home that's a lot. I have been using it ever since in anything that burns fuel. Love all their products.
Reviewed by david:
Use amsoil on my ecoboost Never had a problem with timing chain and used it on my wife's 2008 ford explorer with the 4.0 no engine problems and it has 200,000 miles
Reviewed by Mark:
Have used Amsoil Signature Series for a decade now.
Last oil report stated the engine at 76000 miles is "ageing like a fine wine".
Also use the 2 cycle oil & it's great!
Reviewed by Butch:
I have been using 0W-30 Amsoil Signature Series since about 36,000 mlies on my 2007 F150 along with Amsoil oil filter. 281,000 miles and still running great. Excellent power and good fuel mileage. Of course I also do the other routine maintenance as well. People can't believe how quite it runs and still has good power. Amsoil is fantastic.. Engine still good and tight, no oil leaks!
Reviewed by Matt:
Amsoil products are the best.
Reviewed by dhg-guy:
Used in my f150 ecoboost engine, makes it run smooth, cool, quiet.
Reviewed by ConBro:
Use this in the wife's Subaru Legacy. Used 44k exclusively and the UOA's are perfect every time. Can't recommend enough.
Reviewed by Jon:
I've had great results with Amsoil both on track and on the street. Love them.
Reviewed by Brayden:
The recommended Dexos1 oil for my turbocharger car is 5W30. Amsoil is one of the few (only) companies who offer a high quality 0W30 that is Dexos1 certified. Disclaimer, I have no interest in using 'house brand' for my car. Personally I believe aftermarket manufacturers like Amsoil have more incentive to keep my vehicle lasting longer. I have the luxury of not having to drive my car to work, so the annual mileage is well below average. My car also sits for weeks on end and having the lighter oil helps to quickly lubricant my engine when I start it for the first time. I change the oil once a year instead of the kilometres. Choosing the lighter oil increased fuel economy in the summer and allowed easy starting in the winter on those -35°C days (no block heater). In the winter I enjoy skiing in the mountains so I need an oil that stays fluid in extreme cold. On a hot summer day in stop/go traffic I feel confident running the lighter 0W30 oil in my car knowing that my engine is protected. Overall great product and will continue to use 0W30 Signature Series for years to come.
Reviewed by JK:
Use in a 14 year old truck, no tapping when truck is started after sitting for days
Reviewed by Scott L Rising:
Great oil wish it were a little cheaper
Reviewed by Mt:
works great
Reviewed by Chuck:
Have used Amsoil for the past 15 years. During that time, it has never let me down. Early on, I had oil analysis done and the oil held up extremely well going over 20,000 real miles and still had life left.
You can't ask more then that especially in a dusty environment.
Reviewed by Pat:
oil changes
Reviewed by Voo:
I use amsoil on all my cars weather it is brake fluid, trans. power steering and anti freeze.
Reviewed by Florin:
If you look for quality, performance, fuel economy and peace of mind, don't bother to look elsewhere.
Reviewed by DENNIS THE ELECTRICIAN:
I FIRST DISCOVERED AMZOIL IN 1973 AS I HAD A COUSIN WHO WAS A DEALER. BUT AT THE TIME I WAS A 3000 MILE AVID OIL CHANGER FOR 30 YEARS THEN I REDISCOVERED AMZOIL PRODUCTS AS I WAS TIRED OF CHANGING OIL ONCE A MONTH OR SOINER AS I PUT ON 50,000MILES A YEAR COMMUTING SO IN 2003;I SAID WHY NOT MADE THE SWITCH TO AMZOIL AS I HAD RETIRED AND NO LONGER WAS PUTTING ALOT OF MILES ON A CAR. SO NOW I CHANGE OIL AND FILTER ONCE A YEAR OR EVERY 12,000 MILES I KNOW SINCE USING SIGNATURE SERIES I COULD JUST CHANGE OIL FILTER AND CONTINUE TO 25,000 BUT THE THOUGHT OF ADDING ONE QUART OF NEW OIL TO 6 QUARTS DIRTY OIL I AM STILL NOT SOLD ON THAT. MY ONLY REGRET IS I DIDNT USE IT 30 YEARS AGO WHEN I WAS. COMMUTTING. ALSO USE FUEL ADDITIVES QUICK SHOT , BOOST RADIATOR ADDITIVE AND THEIR EA OIL FILTERS ALL QUALITY PRODUCTS
Reviewed by BL:
I use 0-30 in both of my Honda autos. I switch to 0-30 in the summer and 0-20 in the winter. I have 50k mi on the motor in my Ridgeline and it runs just as good as when I bought it.
I would not use any thing else.
Reviewed by mike:
only oil I use in my cars and motorcycles.........
Reviewed by Turtle Man:
The AMSOIL package included in this oil is great. When uses as directed, it provides the longevity and dependability surpassing the temperature range of use compared to 5w-30 and 10w-30 engine oils. Use of this in both vehicles for many years, truck and car, that require a 5w-30 engine oil. Thanks again.
Reviewed by Joe:
your car was expensive
don't scrimp on the oil
amsoil oil and filters
Reviewed by squire:
I've been using Amsoil for years. I really like using the signature series 0-30 in my engines for quick starting in frigid weather!
Reviewed by Voo:
Like my title everything that goes into both my cars is amsoil products oil-brake-trans-power steering etc.
Reviewed by Pa:
Using Signature Series 0W-30 AZO keeps my ordering simple. At one time I was using 5W-30, 10W-30, 10W-40, 5W-40 European Amsoil products. There was a time in the past years that the "Look Up A Vehicle" applications commonly listed the AZO as the first listed oil as the top recommendation. After comparing specs I concluded that the vehicles using the 40 weight products didn't really need that viscosity per the owners manual and the other 30 weight oils could all be well serviced by the 0W-30 Signature Series. It is a great product and I use it in all the vehicles I own and the family vehicles I service.
Reviewed by Gio:
I've been useing amsoil oils for 20 years I wouldn't use another brand if I was stuck out of oil somewhere
Reviewed by Harry:
I highly recommend the AZO 0W-30 Signature Series oil. I have been using it since it came out and the 0w-30 SSO oil before that. This top of the line oil has kept my car running young, now at 449,000 miles.
Reviewed by Tony:
My order arrived on time and un-damaged. I use Amsoil in my Gatortail engine (Briggs) replacing the oil at 25-35 hours with a total of 550 hours on the engine. The oil holds up very well. When conducting maintenance on the engine the interior working parts of the engine are like new with absolutely no visible signs of sludge build up. I highly recommend the use of Amsoil products. I also use the Amsoil Marine Grease in the lower unit and that product holds up very well as well.
Reviewed by Andrew:
I love Amsoil products. I run this in a 1993 Ford Ranger. With 245k on the motor it still works good and plan on running it for a while. No tapping on start up like other oils. I do alot of short trips with this truck and put alot of hard miles on it, this oil is up to the task.
Reviewed by Robert:
Advanced fuel economy.Superior engine protection.Fully synthetic motor oil.
Reviewed by Michael:
I use SS 0W-30 in my daily driver '06 Mustang. Change interval once a year with an Amsoil filter. The oil flows like water but slippery to the touch. When the engine idles all you hear is the muted sound of wet valves, and when I punch it all you hear is pure muscle; no pings, no knocks, just a well oiled machine!
That car sees only Amsoil products and has 86000 miles on it. I have never had to add a single drop of oil to the engine between oil changes, ever. Every week when I pull the dip stick the same 2 punch holes are wet with oil . . . i rest my case, this is good stuff!
Reviewed by Robert:
I have a nearly 600hp 03 mustang cobra. Based on the used oil analysis I've done over the past 3 yrs, I've gone almost 6000 miles one interval and the oil didn't shear. I don't know if this makes the 0w-30 SS an outstanding oil vs other off the shelf oils, but I do know that high horsepower applications pls e greater stress on motor oils. So extract from my review, what you wish.
Reviewed by
Jay:
I've been using Amsoil for over 25 years! I use 0-30 Signature Series in my 2011 Subaru OutBack since the first oil change! 175,000 miles now & still Purring like a Kitten! Also running in my wife's new Xfinity Q60L !
Reviewed by Larry:
The 0-30 works well in my old Dodge and I plan on using it from now on.
Reviewed by Danjp1975:
I travel a lot every week. I usually drive over a thousand miles each week so I don't need to be getting ripped off in quick change places. I don't really keep track of how many miles I go in between changes any more and I've had no engine issue that relate to wear. This product performs as advertised.
Reviewed by
Mike:
I bought this car used - it's a 2008 Mazda3 S - from my best friend, so I knew its full history already. He's run Amsoil in it since brand new, and I plan to continue the same. It just rolled over 200,000 miles last week, and mechanically, the car has been in the shop twice in its lifetime - both for air conditioner issues. It doesn't burn or leak oil, and never has. When something is treating you this well, why would you switch to anything else?
Reviewed by Steve The 'G' Man:
The Best Engine Protection on the Market ! I drive a 2012 Toyota Camry & The Manufacturer recommends 0-20 Weight Oil..... which is supposed to provide engine protection up to 100 Degrees. Well I live in Las Vegas Nevada where Summer Temps can reach 117 Degrees..... The signature Amsoil 0-30 is far more protection
Reviewed by pappy:
i've been using this oil for many years and i am completely satisfied with it.i actually gained about 2-3 miles more per gallon of gas.i usually change this oil and filter every 8-10,000 miles and when i do it is never black.
Reviewed by lynn:
love this product
Reviewed by Alvin Chen:
After some research I decided to run 0w30 instead of the recommended 5w30. This was to gain some additional mpg. I chose Ams oil since this 0w30 is rated for GM dexos1.
This is the first time using Amsoil, engine got smoother & getting over 60 miles more per tank of gas. I assume the lower viscosity and the quality of oil are both contributing to better
gas mileage. This saves a lot now, so will continue to use this brand.
Canada
United States
ONLY Amsoil!
I've taken several engines apart but only engines that have run Amsoil and they only need coolant system work. Conventional oil precipitates out garbage and sludges up engines resulting in CLOGGED oil passages. If your switching from conventional, get the best protection you can get that has tons of positive history. Do your homework/research to understand ALL the costs involved. You will determine Amsoil is the best switch you can make for your vehicles.