![]() All of the Mobil 1 formulations were now the new SM, the Royal Purple was still SL (this may change). I went to a local auto store looking at various oils to see what was currently available. The bottom line is that if the bottle has "API SM/SL" on it, its NOT the same good stuff as you've been using. This resulted in drastically reduced levels of ZDDP which is NOT a good thing. Oil formulations have (are) changed due to the new API SM rating and the EPA-mandated rules on cat life. They are all synthetic ester based a true 100% synthetic oil. The base stocks used on the my top 3 picks are very very very good. Motul 300V I've seen 15-25hp gain just by oil change alone (turbo charged rx-8) Motul is readily available and is affordable. Then Agip, Redline, AMS Oil and lastly Mobil 1 Top 3 oils I'd recommend is Motul 300V or 8100, Shell Helix, Castrol Edge. Stay away form Castrol (North American ones at least) Castrol Edge in Europe is amazing. "I've done extensive testing with motor oils in a lab. I'm speaking for Motul 300v, Shell Helix, Castrol Edge, Royal Purple XPR (race edition), and Lucas Oils. I'm speaking for the race/ultra premium oils that have been proven in some of the best cars and racing cars around the world. I dont speak for regular consumer oils like Motul 800, Castrol Syntec, Mobil 1, or even Royal Purple's normal formulas. I do agree that the oil weights should remain the same as what is recommended by BMW, so in most cases its 5w-30. And before anything else, lets get one thing straight. And why do all that? Because just like the oil, BMW doesn't make the best everything, and there are far superior products out there. Why would you deviate from "BMW's special blend" of oil? For the same reason you deviate from BMW's suspension systems, exhaust systems, engine management, wheels and tires, short shift kits, intakes and inter-coolers, and everything else you change when you modify your BMW. ![]() The Castrol just makes the engine Soooo much quieter and runs cooler(two needle widths on the temp gauge). I was using Mobil-1 for a few oil changes. Just look at your owners manual or oil fill cap to see which oil BMW reccomends. Don't get too hung up on the oil thickness/grade. lol I think its safe-est to stick with what BMW says to use. Like your Amsoil or Motul, or home brews or teh wrong Castrol or Mobil oils. The rest of that 15% use many different oils. 85% of the ppl here, use one of these two oils. Either BMW's oil(Castrol) or Mobil-1's 0w40 european blend LL1 oil(in the black bottle - that is the ONLY M1 oil that is LL1). Most ppl here use the BMW synthetic oil sold at the dealers. What you will find in the many oil polls here. I know oil cooler is the likely upgrade, but could changing the oil I use suffice until then? I don't really have anything against the OEM oil that I am using now except that when pushed super hard for no more than 3 minutes I can easily see around 255-260*F oil temps. Again anyone who can chime in and give me their opinion/advice would be much appreciated. I read a few similar posts since writing this one, but I still don't feel like I have found my answer yet. I guess my question now after reading this is, which of the list mentioned would be the best for a daily driver that sees autocross, maybe the occasional track (when I get back to the mainland), and a few drag racing events (also when I get back to the mainland)ģ00V HIGH RPM 0W20: Pure Performance (Qualifying sessions, Drag racing, Short tracks) Low Engine Fuel Dilutionģ00V POWER RACING 5W30: Performance (Qualifying sessions, Short tracks, Up hill races)ģ00V POWER 5W40: Performance (Tracks, Rallyes, Up hill races)ģ00V CHRONO 10W40: Performance, Reliability (Qualifying sessions, GT)ģ00V COMPETITION 15W50: Reliability, Performance (Any Race)ģ00V LE MANS 20W60: Reliability (Endurance) After visiting the Motul page I saw this (note this is for the racing oil section though): It is broked down by product name, grade, profile, race type, and engine fuel dilution. Unless I read wrong, after visiting should I go down one and instead run 5W-20.
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