I've used Valvoline 85W-140 semi-synthetic in a 126 diff. for the past 75,000 miles. I live in a very warm climate - winter is non-existent. This viscosity may not be suited for others.
If the synthetic lube is not right for my MB, I've yet to see why.
Quite/smooth operation.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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