In Reply to: I've heard Amsoil is great BUT... posted by Jon on August 15, 2001 at 15:54:13:
...are you sure about the 0W-30? Most people seem to believe the S14 is better served by higher viscosity oils. I don't know why and I've never gotten an explanation but that's what the M3 "gurus" seem to think. Amsoil does have a Series2000 20W-50 that may be better suited to our cars. The only problem I could see would be in Northern winters.
Unfortunately, Redline and Amsoil both only compare themselves to "leading brands." It would be cool to see an Amsoil/Redline shootout where they are subjected to the same tests.
Its pricey, about $8 a quart, but well worth it. This oil makes a difference you can actually FEEL. Its very thin oil, so the engine spins up a bit quicker than it does with the thicker oils. Also, the oil warms up quicker and cools better than others. Your gas mileage will improve a bit also, due to less friction from the thinner oil. A guy by the name of Bob///M3 from the E36 M3 board did a TON of research on the subject of oil, talked with oil chemists and everything, and came to a definite decision that Amsoil Series2000 0W-30 is the best oil for higher performance motors (such as the S14) with tighter bearing tolerances. On top of all this, the Amsoil offers better protection LONGER, meaning that you wont need to change your motor oil as frequently. Amsoil even says that 35k miles or one year is the limit! I’d recommend changing it a bit more often than that though!
Previous owner was using 5-50 Castrol Synthetic. Should I stay with this? Any opinions?