Quote:
Originally Posted by dxb335d
Mine is an E46, and they had engine bearing issues. BMW asked Castrol to do some Investigation.
Anyhow, Castrol developed another 10w60 but this time with a higher shear strength which was able to cope with the tight tolerences ad 8k limit of the highly strung S54.
So they have two 10W60 oils, one especially formulated for the S54.
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Same here - two E46s in the past. One of which went through the bearing/con-rod replacement surgery and both still used Mobil 1.
The problem related to contamination during assembly in the lubrication system and oil pump tolerances for vehicles built Oct 2001 > Feb 2002. Not quite sure what Castrol had to do with it, given the vehicles were using Mobil 1 at the time of the incident. Surely Mobil/Exxon would have been involved in the investigation, if BMW engineers felt their expertise was required...?
As mentioned in another post, it's marketing and BMW doing a deal with a supplier. Which BMW owners mostly put in Castrol because "it's recommended", regardless of the specification required and other oils meeting that spec? If they "recommended" another manufacturer, most BMW owners would use that instead.