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So, I changed all the cars (740/760 turbo/850) to synthetic...Mobil 1 10-30. This is what was available in my local stores....New York here...weather getting colder...low 30's, expecting even lower. I tried to get some info about weights, but was not successful... I know that Mobil makes a 5-30 and 0-30. Under what conditions should these be used? Did I make a mistake? Change intervals? 3,000? 7,000? with filter/ or not? I used to change at 3,000 with "regular" oil, thought I could get some more time with the synthetic....Please advise....Alan
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