I use amsoil in my trans am. Never had a bad experience with any oil but everyone seems to love amsoil so figured it couldn't hurt. Especially with an engine that makes some power.
Just finally did my yearly oil change on my old faithful 04 wrx 177k miles last week. Put 14,370 miles on the signature series 0w40. Oil sample got in today. 31% oil life. Very little brass, relative clean oil. Waiting for my rod bearings to die but if this keeps up they might last a bit longer! Keep in mind I was using amsoils 25k mile oil filter aswell.
I use Motul 300V Power 5w40 for my Stage 2 tuned S5 3.0 TFSI.
0w40 signature series amsoil. Went 9100 miles of hard, extremely hard miles 73% oil life remaining. Filter changes every 5k. Use it in all my turbo cars now.
but I bought the ECS Oil Kit for the MK7 that includes O-Ring, OEM Filter, Plastic drain plug and Motul oil and it was $55-60 I think.
A rotary engine builder in my city with 30 years experience absolutely swears by Amsoil XL 5w30. So that's what I use in my RX8 now.
I just changed the oil with 2,960 on the odometer. This is the car's first oil change. Used zero oil since new. New Mann filter and Motul 5-40. Can't prove it but I swear it runs better.
Initially I used Mobil 1 0w-40 for the first few oil changes... Engine Idle was sort of noisy for a car that had less than 50k miles. What made me switch was when I opened up my oil cap on 2 different occasion to see smoke come out. After that I switched to Motul. With motul the power deliver was more smooth, less aggressive. Engine idle was quieter. The car felt slower but the engine overall seemed healthier. Most importantly i havn't exxperince smoke after opening the oil cap since switching over.
It might be due to a difference in oil viscosity. With usage the Motul oil has sheared down to 30 weight which makes the engine run more freely and cooler as compared to fresh Castrol which has not accumulated enough hours to lose viscosity. It's been well documented that a viscosity decrease lowers oil temperature.
For example- my turbo used to rattle just for a second upon startup, I always thought this was just because the oil drained out and the pressure needed a sec to catch up when starting - but with the Amsoil its whisper quiet - almost like it creates a film and stays there ready for the next start. There's a few other minor good things about this oil that I've noticed - that's just one of them. Really highly impressed with Amsoil.
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