Hi,

I was hoping to treat my engine to some quality oil...
Diesel mechanic (of some 30 years) says that an engine over 100,000km/60,000miles should stick with mineral. I asked why? and he said it was because the main bearing clearances would not like the thin oil and not good for timing gear either.

Should I stick with the mineral oil (currently using 10w/40)? or move to synthetic and hope for the best?

Any input will help me to make a decision.

Thanks,

1994 E300 diesel: OM606.910 NA (233,000kms/145,000miles)

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1995 E300 Diesel