Product Reviewed: Small Engine Motor Oils (ASO,ASE)
Current Rating: 5 out of 5 stars
Votes & Reviews: 15 vote(s) and 26 user reviews.
Reviewed by W: 
My mower runs cooler/ quieter and since this oil I don't ever have to add oil between cuts. It's worth Every penny!!
Reviewed by Kenwood:
I bought a new riding mower and wanted the best oil I could find for it. I found the Formula 4 Stroke small engine oil and liked the fact that it was specifically designed for small engines. This year has been very hot and the grass has grown like crazy so the Amsoil has been put to the test and passed with flying colors. This is the only oil I will put in my mowers from now on.
Reviewed by W:
My mower runs cooler/ quieter and since this oil I don't ever have to add oil between cuts. It's worth Every penny!!
Reviewed by Jack:
Generator
Reviewed by Jack:
Generator
Reviewed by WD:
We use Formula 4-Stroke in our commercial lawn mowing business...45 deg F to 100 deg F. It is proving a great oil, no consumption, engines still running like new, and the oil still looks fresh at the OCI. At the 10w rating, it will be fine for cool weather mowing. I'd use the 0w40 formula for severe winter OPE use.
Reviewed by Big guy:
Using on small engines generators lawnmowers and snow blowers
Reviewed by Northeast Homeowner:
I use this oil in my 36 inch walk behind mower, the snow blower and a permanent outdoor standby generator. These small engines are still full on the dipstick at their annual oil changes and the oil looks clean. All of this power equipment is now 10 years old and they are still going strong. Thanks for making such a great product for small engines.
Reviewed by Leonard:
Typical high quality Amsoil product. I use it in my 3 mowers.
Reviewed by None:
I use a soil in all my lawn and garden Equiptment , very happy with it ,without a doubt the best oil there is,
Reviewed by Steve in Tennessee:
I use this oil in my walk behind mower & lawn tractor. One change through the season with about 50 hours on the work horse lawn tractor & the oil is still still clean, I almost feel wasteful when I change it.
However, I know better. I've used Amsoil for the last 12 years & have not been disappointed.
Reviewed by Brian:
I use this oil in riding and push mower with no problems and know its of the same quality as the automotive oil. I've found Amsoil to be a very reliable especially when I lived in the midwest and will continue to run Amsoil is all my vehicles. I give two thumbs up to the Z-Rod oil as well my '62 Galaxie sure likes this oil.
Reviewed by JCD:
Has treated me well in all 4stroke small engine equipment for over a decade. Have a 10+ year old power washer, generator, and lawn mower that are still running as good as new.
Reviewed by Shakey:
I bought a new Exmark 24hp Kawasaki engine got 300 hr on it already change it ever 50hr so far not been a hair below full at 50hr yet
Reviewed by PB:
I use the formula 4 stroke in all my small engine equipment: pressure washer, lawn mower, engine-driven air compressor, brush mower. I feel it's a quality alternative to brands at local parts stores and it gives me peace-of-mind for longer oil change intervals and severe duty service-just as intended.
Reviewed by PB:
I use the formula 4 stroke in all my small engine equipment: pressure washer, lawn mower, engine-driven air compressor, brush mower. I feel it's a quality alternative to brands at local parts stores and it gives me peace-of-mind for longer oil change intervals and severe duty service-just as intended.
Reviewed by Shakey:
I bought a new Exmark 24hp Kawasaki engine got 300 hr on it already change it ever 50hr so far not been a hair below full at 50hr yet 👍🏼
Reviewed by WD:
We use Formula 4-Stroke in our commercial lawn mowing business...45 deg F to 100 deg F. It is proving a great oil, no consumption, engines still running like new, and the oil still looks fresh at the OCI. At the 10w rating, it will be fine for cool weather mowing. I'd use the 0w40 formula for severe winter OPE use.
Reviewed by Big guy:
Using on small engines generators lawnmowers and snow blowers
Reviewed by Northeast Homeowner:
I use this oil in my 36 inch walk behind mower, the snow blower and a permanent outdoor standby generator. These small engines are still full on the dipstick at their annual oil changes and the oil looks clean. All of this power equipment is now 10 years old and they are still going strong. Thanks for making such a great product for small engines.
Reviewed by Leonard:
Typical high quality Amsoil product. I use it in my 3 mowers.
Reviewed by None:
I use a soil in all my lawn and garden Equiptment , very happy with it ,without a doubt the best oil there is,
Reviewed by Steve in Tennessee:
I use this oil in my walk behind mower & lawn tractor. One change through the season with about 50 hours on the work horse lawn tractor & the oil is still still clean, I almost feel wasteful
when I change it.
However, I know better. I've used Amsoil for the last 12 years & have not been disappointed.
Reviewed by Brian:
I use this oil in riding and push mower with no problems and know its of the same quality as the automotive oil. I've found Amsoil to be a very reliable especially when I lived in the midwest and will continue to run Amsoil is all my vehicles. I give two thumbs up to the Z-Rod oil as well my '62 Galaxie sure likes this oil.
Reviewed by JCD:
Has treated me well in all 4stroke small engine equipment for over a decade. Have a 10+ year old power washer, generator, and lawn mower that are still running as good as new.
Canada
United States
The only oil for my mower!
I bought a new riding mower and wanted the best oil I could find for it. I found the Formula 4 Stroke small engine oil and liked the fact that it was specifically designed for small engines. This year has been very hot and the grass has grown like crazy so the Amsoil has been put to the test and passed with flying colors. This is the only oil I will put in my mowers from now on.