Customer Ratings & Reviews

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!

#1 for 3.5L ecoboost

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 !!!

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.

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.

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.

Instant satisfaction, after the first start up i could already hear and feel things running smoother.

I use Amsoil on my SUV and love it!

Always met my expectations.

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.

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.

Bestboil products on the market by far. I run it in all my vehicles

Great product gives better fuel mileage and cleaner oil after changes

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.

I have been using Amsoil since 1979. I started as a dealer while in the Air Traffic Control Acadamy. I maintain between 4 and 8 vehicles routinely [currently 7] and I would not have time for the routine maintenance if it was not for Amsoil. Amsoil is the best oil and by, far the best, oil filter in the industy. My twin sons just became 16 years old. For their birthday I taught them how to change oil in their vehicles using Amsoil. I am passing down the tradition of using Amsoil as my legacy to them. It is the best advice that I can give them.

This is great oil. My 1997 suburban has 298,000 miles on it all were with amsoil . No engine problems. Clean internals (had to remove the intake for injectors). No engine noises, used very little oil. I will be using the 0W-20 on my new one.

I have a 2005 Dodge magnum with the 5.7L Hemi that I bought with 2200 miles on it. Shortly after I switched to Amsoil and it now has 130000 on it with only 6 oil changes. All Amsoil oil and filters. At 100000 the transmission and differential were also changed to Amsoil. I have had no problems.

Don't worry

Love this stuff have been using it for years!!!

I use it in both my trucks, and I'll keep using it. Great oil, great filters, I've never had a problem with the oil or filters.