I plan a switch to Synthetic Oil thi winter before it gets too cold.
Would Mobil 1 Synthetic 10W 30 be better than a switch to 10W40 standard oil? I'm running 15W14 right now. I plan to do a tranny fuild and filter change soon, any synthetic ATF fluids you guys recommend? additives?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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