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I have read the FAQ on oils. Is it better to go with the sythetic (as is recommended in this FAQ) and not change the oil but every 10,000 miles?! I have heard that older vehicles (10+ years or older) should not go to synthetic. The Volvo mechanic in our area said to use 10-30 Havoline. He claims that Havoline does not leave residue. I have two 240's (1983 with 160K and 1990 with 122K), but they are both new to me. What are the opinions and experience with Volvos and oil out there?
Thanks!
dazsa
Don
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