Customer Ratings & Reviews

I've been using 5w30 Signature Series of over a year and a half in my 98 Chevy K1500 with over 285,000 original miles on the motor. The motor sounds so smooth and slick. Next I put it in my wife's Subaru Outback with 104,000 miles and the motor is so quiet and purrs like a kitten. This oil has been the best I've ever used.

I have been using AMSOIL products since 1976 in all my equipment because I know I am giving my equipment the best protection money can buy. An added bonus is an increase in fuel efficiency as well.

Have used AMSOIL for a number of years. SVT Focus has 345,000 miles with no trouble.

My 04 GTO has always ran amsoil since it came into the family and years later it still runs great

I have a 2012 CTSv driveline in my 1971 Cutlass I have noticed that the supercharged LSA motor is showing 4lbs better oil pressure and less mechanical noise.

I have been using amsoil for 2yrs now and I can tell a difference between amsoil and mobile 1 which is what I was using. Don't get me wrong mobile 1 is great oil, but my Toyota Camry sounds quieter and smoother with amsoil signature series 0w 20.

It’s the best plain and simple

Good

I've been using Amsoil Signature series for over a year now. Won't use anything else in my vehicles!

Great product, worth the cost.

Very pleased

Just what my Shelby GT350 needed.??

Great product! I use and highly recommend the signature series in my daily and my fun car! Noticeable improvement on acceleration and much cleaner and quieter engine operation!

I use this oil in a turbo BMW as it is called for this weight. Since I like other weight oils from Amzoil, I use this in the BMW.

Used in my 2007 Ford F-150 with 220,000 miles.

I have been using this this in all my vehicles since 1992. In my new cars I change to Amsoil at the first oil change. when I retired from Work Jan 2012 I was driving a Dodge Neon, 4 cyl standard shift. I drove 98 miles round trip every time I went to work. Used this Amaoil and also put Amsoil in the manual transmission. I had 160,00 miles on it when he flew to Fla from Pa to pick it up. He is still driving it. Drives up the Pa turnpike every day. He turned over 300,000 miles on it about 5 months ago. Still has the original clutch.

Great Oil, use it in all my LS motors. Many of them have exceeded 300,000 miles already

Great stuff!! The fact that I can pair this and an Ea filter to go to 15k every change is awesome. I would and do recommend this to friends and family for its outstanding performace and reliability.

Is there something proven better to use? I researched before first purchasing this oil for nearly 13 years in the same 2002 Ford F150. Use the Amsoil filter to trap more contaminants that occur over time as well. The vehicle has less than 29Kmi on the odometer. My most recent oil change had less than 850 miles over a 13 month period. It's perfect for preserving and extending the life of any engine and with my truck this oil is an absolute.