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Well, that may be so, but you need certain amount of TBN remaining in the oil for it to protect effectively from the acidifying effects of blow-by gasses. Mobil1 just drops to near zero after 3000-4000 miles, meaning: your oil becomes too acidic.

Other issues I've seen is higher content on fuel dilution, resulting in much lower oil flash point. Just bad juju over all.. "

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Yes it does meet the BMW LL-01 requirements. ...but as I said before, it gets beaten down too quickly compared to other oils that are also BMW LL-01 approved.

That's all I was trying to say.... Nothing more. "

" Mobil1 0W-40 is oil that I've tried throughout the years on many cars. I've done extensive and prolonged oil analysis over the course of several years. My conclusions are such that Mobil1 0W-40 is not a good oil for anything longer than 3000 mile oil drain interval. Reasons: it gets beaten down way too quickly, so it becomes more like 0W-30 too soon and it drops its TBN too quickly as well. Furthermore, Mobil1 0W-40 is NOT a pure Group 4 synthetic oil.

I would recommend Valvoline SynPower 5W-40 HST (not MST) if you can find it at a good price. It's pure Group 4, has an higher TBN than Mobil1 and it lasts longer. "

" Grand prizes suck in my opinion. Instead of throwing 1 big grand prize, just offer 10-20 smaller prizes, if you really want to thank the community, rather than just one member of it.

..and I am on board with the rest of the crowd: gift certs are the way to go, especially from vendors with diverse inventory like VAC and Turner Motorsports. "

" Good info guys! I talked to the manager of the station. It is indeed leaded fuel. I'll stay away from it. "

" I discovered a somewhat local gas station that sells 100 octane race fuel for $6.99 per gallon. Considering that regular 93 octane fuel is $5.15 in Chicago, this is not a bad deal at all.

The fuel is leaded though. However, I don't think it will be an issue, considering that I am fully catless.

Your opinions? "