Originally Posted by RIPGermanCastrol
Cool. I still have my 08 135i with nothing but the ppk tune, and I will fill that with Castrol 0w-40 because of its near-stock output and I'm planning to sell it soon anyway.
Two questions for you guys more in the know:
1. Is 0w going to be significantly beneficial to me in the Georgia climate compared to 5w, and the same thing for 5w vs 10?
2. Is there any general consensus of how amsoil, redline, ravenol full synthetic, and other "high end" oils stack up against each other, or would anything of those be similar to each other and a cut above stuff like M1 and Castrol?
3. What would probably be better for the engine: using Castrol 0w40 with 3k intervals or redline/amsoil/ravenol with a 7-8k interval?
1. 10w is good down to -25c, 5w is -35c and 0w is good as cold as -40c, so it depends on how cold your weather can be in Ga.
2. Redline is exceptional if you want maximum protection under extreme hard use. I can't comment on Amsoil because I've never used it.
3. Redline Xw30/40 depending on your oil temp, changed every 7-8k would keep that engine very clean and very happy, Castrol might struggle with the temperature in something as highly tuned as your car