Customer Ratings & Reviews

First time purchasing this oil. Obviously the cost is a bit more than other oils, but most of the long term reviews help justify the price. A cleaner engine will have better mpg and ultimately last longer.

I like using this oil in my 2014 4Runner because of its longevity. I plan to change my oil regularly, but if I don't hit the dates or mile exactly, I like having the built-in safety of this long mileage oil.

Long lasting

I love AMSOil! This it the only product I use in my 2016 F150 Roush Stage 2 truck! I definitely recommend to everyone.

Just over a quarter of a million kms on the vehicle and no signs of any problems etc. Engine silent and smooth. Oil change every 25,000 kms or one year so easy to track.

Been using this oil for 23 years and have nothing but good things to say about it!

There is no better motor oil on the market than Amsoil Signature. Matched with an Amsoil oil filter, you have premium protection for an entire year.

Great oil

I have been using Amsoil for years and believe it is the best oil available. I also use their oil filters so I can go one year between oil changes. very convenient.

Don’t have to change your old often

Don’t have to change your old often

Amsoil is the best full synthetic oil there ever was, buy some.

I love this stuff, Its all I use in my vehicles!

I really feel that amsoil is best oil on the market by far, only company that tests its oil against all their competitors!

Folks, this Synthetic Oil is simply the best manufactured oil money can buy. If you care about protecting your investment, while using the best product in the market, then look no further.

I have not done a legit full break-in for the motor I am rebuilding. Only did 100 miles running time with regular driving using break-in oil for now.

The best synthetics Period,

I was using royal purple and was using a quart between changes. I switched to Amsoil and it stopped. I will only use Amsoil now

The best oil on the market but, overpriced.

I bought a 92 500SL that had been serviced every 10K or so for oil changes using Castrol 20/50. I bought it at 67K on the clock, and upon inspection, the engine had an amber deposit all over inside. It Would not come off with solvents. I poured in 10 Qts of the AMSOIL 5/50 into the engine ( factory cooler is huge) 2 yrs and 8600 miles later I had oil analysis done to find a TBN of 6.9 still remaining and 2 PPM aluminum, which was commented on by the Blackstone Lab as unheard of in an aluminum engine. I recently used a horoscope to look inside and up at the underside of the valve cover to see NO amber coloring anymore, just aluminum.