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.
I used castrol edge 502 spec , although Iwatched pauls from DAP video and he specs Liqui Moly, which seems like a high quality german oil.
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.
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.
I use Synthoil 5w-40 seems great. Lower consumption early on till about 4K miles then on par with consumption others report.
Liqui-Moly produce good oil in general, in my country all subaru enthusiasts use it for engines also!
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.
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.
Amsoil dominator 15w50 Cold (15c ambient) start up pressure = ~70psi Warm (200f) idle pressure = ~35psi Max hot (~270f) pressure @ 5th gear WOT = ~87psi and it holds steady Cruising on the highway (220f @ ~3k RPM) I see ~65-70psi Everything is well within factory spec with added protection, less consumption, proper flow, and better high heat retention. I'm gonna stick with Amsoil for a while.
I ran this for 200k and ways very happy with results. Had the oil tested twice in a lab and was happy with the results.
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