Which oil for hi-mile MB inline 6?

Joined
Jun 22, 2008
Messages
282
Location
Central Valley, CA
'97 e320 with 243k has run on Mobil 1 its whole life (10w30, 15w50, and recently 10w40 HM). Engine burns no oil, and leaves a single drop on the driveway every few nights from a seeping timing cover & head gasket. Cold temps aren't really an issue here in the central valley (30 deg - 110 deg). Which of the following oils from my stash would you run in this car for the next change? German Castrol 0w30 Mobil 1 0w40 Mobil 1 5w40 TDT Mobil 1 10w40 HM Mobil 1 15w50 Was also thinking of a Mobil 1 5w40 mix with equal parts of 0w40, 5w40 tdt, & 10w40 hm...
 

JHZR2

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Dec 14, 2002
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46,629
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New Jersey
I'd put rotella 5w-40 in there. I'd do with a 5 or 10w-40 regardless, personally.
 
Joined
Nov 30, 2005
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3,439
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FL
If you just recently started the M1 HM oil I would stick with it for a little longer. JMO.
 

opposite_locker

Thread starter
Joined
Jun 22, 2008
Messages
282
Location
Central Valley, CA
Upon further inspection, I have exactly enough 10w40 HM left for another oil change...might have to try it alone one more time. After than, will likely go back to 15w50 or try out 5w40 tdt. Anyone know how long the effects of "high mileage" oils tend to last? For example, if a "high mileage" oil decresed oil loss by 75%, will that effect continue after switching to another oil? Or will I have to continue HM oil use to keep the seals "conditioned"?
 
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