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What are the advantages and disadvantages of euro oils over the normal full synthetics we typically see here is the U.S.? Like you choose valvoline euro synthetic over the valvoline advanced synthetic... I notice euro oils tend to be high calcium, have good doses of zinc and phosphorus...

I know both of these atf's are well regarded. I would like to know your opinions and experiences with them, but also what drain interval should be used with each one. I am using it in a vehicle requiring dexron 3 and would probably prefer the one I can run the longest, unless there's evidence...

The owners manual for my vehicle lists multiple viscosity options, but 2 of the 3 are 30 weight oils. The other 1 is a 40 weight oil for higher temperatures. My question is does it make sense to use a 40 weight oil when it's hot, because when at operating temp it shouldn't require a thinner or...