Customer Ratings & Reviews

I have been using this oil for a few years and find that it keeps the engine very clean and performs very well. In my onion, I find that this is one of the best oils I have used. I also use Amsoil in my diesel truck.

I use Amsoil in my Dodge Ram 5.7 Hemi 4x4 and both of my Harley Davidson motorcycles and I am impressed with the performances! I switched to Amsoil because I got tired of going to the local auto parts stores and they are usually out of what I use, so I went with Amsoil and it is delivered to my front door, love it!

I have been using Amsoil since I was in my 20’s so for over 20 years now. In my last Cummins I would send samples in and have it tested. Even though at 40k miles it always came back good I could get myself to keep going. So I know for a fact you can go a good 40k. Just change the filter every sample you pull and replace the oil from the filter with new.

I have had many years experience with all your products and have never had an issue. And the service is excellent,never had a problem with any orders, always exactly what i ordered ! What a pleasure.

Have been using Amsoil for the last 20 years..now..in my 2023 GMC Acadia 3.6L engine I am getting 32.7MPG on highway driving and 25 mpg running around town shopping...ETC..i do my own oil changes..and when i change the oil (signature 5w-30) it looks like N E W OIL..!!!!!!!! PLEASE do urself a favor & feed ur engine AMSOIL OIL..!!!!

Wow. I’ve been stuck on not “100%” synthetic with Motorcraft while the car was under warranty and I couldn’t use anything else. Time was up. Switched to Amsoil and headed out on a 800mi road trip. Temp stayed very consistent avg 80+ on the freeway for hours. Drivetrain noise is lower, oil looks like I just added it. I’m SOLD! Wish the USA would get more transparent when it comes to oil quality. This stuff is top notch and I’ll be using it in all my vehicles (and recommending it friends!) moving forward.

Best oil available

I live in a rural area and as a single mom of 3 kids I have to drive a lot. I can easily put 600 - 900 miles on my vehicle in just 7 days!! I use synthetic oil in all of my vehicles and will have to change my oil every 4-5 weeks with regular synthetic oil….so it just makes sense for me to use ALL amsoil products as they don’t have to be changed as often plus they really do help your vehicle perform better. I just recently switched my daily car to this oil and almost immediately I noticed my car ran so much better and even gets better gas mileage. I will be switching my other 2 vehicles to amsoil on their next oil change.

Since day one, my 2023 Explorer ST TT has used this oil; I changed the engine oil at 10 miles on odometer. Never has issues at 10,000 mile oil changes and can tell a slight difference with Engine temps and performance as a daily driver. I also tow a lawncare with this; my lawncare equipment also uses Amsoil

I've been using Amsoil since the early ' 80s. Always inpressed with its anti- wear performance and long drain capabilities. Outstanding!!

AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil,,,great product and great price

I've been using Amsoil on my 6th Gen ZL1 since I got it and have never had any issues. Oil pressure is higher than oem oil. Would recommend.

this oil has kept my 02 yukon in perfect mechanical shape! she always starts on the second bump (the fuel rail has to charge) 180K miles and it still passes emissions! i use AMSOIL in everything i can! Guaranteed to be the best!

I own a 2003 Ford Explorer Sport (297K miles) & a 1999 Lexus ES300 (188K miles) and have been using the Signature Series motor oil for about three years. I know this oil is supposed to be good for 25K miles, but I change my oil every 7K. While I don't pretend to know what's going on inside these engines, I have experienced zero oil related issues, and I trust this product. Good marketing strikes again!!!

Been using the supreme protection for years and no problems at all

There is no better oil than AMSOIL Signature Series oil. I've been using AMSOIL for 30 years and it has always been exceptional. I will never use any other oil but AMSOIL - period !!!

My engine never run so smooth!

Been using their oil in all my diesels.

This engine in it's beginning back in the 90's was spec'd for 10w-30. In my opinion, the debatably worst decision Chrysler ever made will quiet down and run buttery smooth. It's not going to turn the torque-less wonder into a powerhouse, and your mpg might drop a fraction of a percent but come on, you're driving a vehicle with the aerodynamics of a refrigerator box. At the very least, give your mini-van engine the oil it needs.

Love this oil and my car loves it