quote:Originally posted by sprintman:
It was the BMW dealer oil till Mobil lost the contract to Castrol (Edge 0W40). Most BMW indys still use M1 0W40.
Sprintman,what do you mean by 'indys'? Most 'race' cars are not using the oil you "think" they are...or have been paid to "say" they are running. They are using something you will never know about---and everyone in the know,is fully aware of that fact!
This 0w-40 oil is not the best oil out there by a long shot-----it cokes,and sludges. I won't use it for this reason.
This link is straight from Mobil.
http://www.mobiloil.com/USA-En...o_Engine_Coking.aspx
Realize that coking creates carbonaceous deposits(carbon) that are very abrasive like sandpaper, and consequently cause rapid wear!
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Link Quote...
http://www.turborepair.com/
http://www.flickr.com/photos/7...20@N02/2200663966/#/
http://urbanracer.com/articles...ewer.asp?a=3283&z=42
But when the engine is shut off, temperatures can rise to 600 to 700 degrees F. inside the housing as the turbo undergoes a period of heat soak. The oil oxidizes and forms coke deposits in the housing that then act like an abrasive to wear the bearings.
Charbroiled oil can also bring down the hammer on an unsuspecting center cartridge. Coking is burnt oil residue, a hardened version of the sludge we see falling from the sky in those Castrol GTX commercials. The coked oil blocks the flow of oil through the bearing, which signs the turbo's death certificate.