Engine oil Shell or AMSOIL

You need to run the 507.00 spec oil. I have been running Shell Rotella T6 Heavy Duty Diesel 5W-40 oil. They other one that I want to start using and is more widely recommended is Liqui Moly 4200 Top Tec 5W-30. The reason why I mention this is because the 507.00 spec oils has better lubrication then the other 501 and 506 spec oils. If the wrong spec oil is used it has a tendency to produce premature Cam shaft lobe wear requiring the replacement of the cam shafts.

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.

personally, I'd use Rotella T6. It's a full synthetic oil marketed for diesel engines or "heavy duty" but it's a low saps 5W-40 oil that is perfectly fine to use in a gasoline application.

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 have always used 15w-50 on VR6's and 5w-40 on 1.8t's and 10w-60 on the track cars. Try out Rotella T6 5w-40. I ran Motul 5w-40 on my 911 and it made tons of extra noise, went to Rotella T6 under advice from my tuner and it quieted it right down. Been using it on my Saab as well which has a noisy chain setup as well and it worked wonders.

I've been hearing lots of good stuff about Rotella t-6 i just changed mine to that the first time this month for the winter

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.

So this morning I went n got some Rotella T6 5w40. filled her up and drove it pretty far. The light didnt come back on. I guess all I needed was an oil change? Sounds a lot quieter in idle too, no ticking besides the fuel injectors.

I go back and forth between white jug rotella in the summer and t6 in the winter. It's cheap, and I've never had any issues.