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San Marcos, TX

i kinda work on cars. somewhat mechanically inclined.

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i have a 2004 volvo xc90. in the owners manual it says to use castrol oil and that synthetics will be provided for customer at request. now then i called a volvo dealership and an oil change shop and they both told me that volvo recommends using synthetic. can i not use conventional? also the owners manual called for oil changes every 7500mi. (you have to scroll up a bit for the oil info on the link)

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