My 276k mile Xterra still trucks along with motul, every 3k miles.
changing the engine oil and using motuls 10w40 fixed it and getting mileage around 40.
I replaced the company oil to motul 10w40 engine oil, the changes weren't drastic but the milage and smoothness improved over the time
I have use Amsoil European since new! 185,540km so far, and still purrs like a kitten, does not use oil, and the oil is highly rated!
I use Amsoil 20w40 in all of my semi truck motors. I change it according to what the lab says the condition of my motor and oil. I am going 100,000 miles on my over the road trucks. I go 25,000 on my power stroke and could go much farther.
I've recently started using Motul 7100 10w40. Actually I'm due for my first change and should get under it today. It's the only pull I've ever used that actually made a noticable difference in operation. The esters bond and quiet the motor to a noticable audible level. It's designed for motorcycles though and with the unique properties of this ester based oil, I'm taking a chance with carbon build up, but the protection at higher rpms it provides gives me confidence under those conditions, which is where carbon is best loosened at too. Supposedly this burns fairly clean for a synthetic, but IDK. I'm changing at 3k miles to see how it looks. May or may not extend it out, but has felt great so far in this 135k mile motor.
I switched to 5w-30 instead of the factory spec 0w-20 and that slowed down my consumption. I use Amsoil to maximize protection with use of the "wrong" oil weight and I monitor wear with oil analysis and seem to have no change in wear from my 0w-20 use.
I'm using motul x clean 5w40 for the last 15 years on my m54b22 and it s perfect. I tried also ravenol, liquimolly but motul was the best.
I use Motul 8100 5w-30. But I've heard the Ravenol is good, I think it's what one of the 86 racing series runs.
I also tried Ravenol's MT fluid, and I'm thinking I'm going back to it after the RedLine.
Absolutely Liqumoly!
Please never put Amsoil in a Volkswagen they under rate their viscosity/ wt ratings and the only time I used their oil I ended up spinning a rod bearing in my first R32
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