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Message: <blockquote data-quote="daewoolagunza" data-source="post: 2449117" data-attributes="member: 506715">...full synthetic.? I have a 1989 Acura legend the car was brought brand new over in California and the origin al owner always changed her oil with conventional oil every 3000 miles and the carb was maintained by the dealer using 10:30 weight conventional. Ever since she moved to Florida she has been using 5:30 weight gtx high mileage oil for the past 6 oil changes should I keep  using gtx high mileage oil or can I switch to 10:30 mobile one full synthetic oil.</blockquote>