After almost five years of Pennzoil and an engine slowly getting to be noisy first I ran the signature 0w40 and noticed a great improvement but decided to give the XL 10w40 a try for the summer camping season and so far this oil is working beautifully no MDS codes and finally an engine that’s as quite as the day I bought it. I do plan on running this from now on in my Ram thanks for a great product

Perfect for my 2018 GMC duramax.

i use this in everything i have, used it in the 70's and saying what i said in the review about the 5w-20, alot of memories and alot of confidence in it today

i use all these in everthing i have, i remember in the 70's this came in a qt can and cost alot more but it was worth it, as young airmen in the usaf we tested it ourselves in many crazy ways and was always amazed at the results, i have memorys and confidence in it's protection

My engine loves it

I love all the AMSOIL products I run it in my 6.4L SUPER DUTY my generators and riding mowers. They all run a lot better using these products compared to all other brands.

I have been using all Amsoil products for many years and have never had a problem. We use in F250,Road Race car. Racing Boat, and all the family vehicles. I use all there accessories they make. I would say that all there products are a 5 on the 1 to 5 scale. You can’t go wrong.

For the last 15 years or so I only use Amsoil in all of my vehicles; car, truck, motorcycle, lawn mower & snow thrower. I drive under 7,000 miles a year in my truck and with that few miles the oil only gets changed one time so the XL makes more sense than the signature oil; however I have used both and at oil changes oil still looks pretty clean.

For the last 15 years or so I only use Amsoil in all of my vehicles; car, truck, motorcycle, lawn mower & snow thrower. The XL oil works good in my car because I travel about 21,000 miles a year driving back and forth to work. It doesn't make sense to use the signature motor oil due to the miles, however when oil is changed it's still pretty clean.

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as slippery when drained as the day it was filled

I own a 2007 Jeep Wrangler that was burning a quart of oil every 500 miles. I heard a man talking about the 3.8 liter engines that ran so hot that non synthetic oils would evaporate in this engine. He recommended 100% synthetic oil and he recommended Amsoil. He also said that you wouldn’t have to change the oil until you had approximately 6,000 miles. I now have 6,500 miles on my first oil change and have not had to add any oil. I check the level quite often and the oil still looks almost like it did the day that I put it in. I am very impressed with this oil and will always use it. Thanks very much Amsoil.

Always top performers

I've used this oil in my wife's cars for years now and it has performed beyond expectations will never go back to any brand oil on the market.

As usual , great product, wanted the extra protection due to it's going in a turbo vehicle and the extremely hot temperatures here in Arizona.

Started using this oil at purchase of truck very clean and stable product.

Super product and always fast delivery because I'm only a 100 miles away from there warehouse

Amsoil-Best oil

Runs great in my truck and it’s eco friendly, oil changes are less frequent and it protects throughout the rated time.

I've been using a oil product for numerous years now we have three vehicles right now and all three of them are switched over to Amsoil! Love the drain interval with this oil I have 292k on my Escalade still running strong!