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Hate to disagree, but I must. It's been proven that Synthetic oils can be used for extended periods of time and milage. It's not a sales tool...it's simply fact. You can do much better than Dino oils. Suggest you get a copy of the motor oil bible by Michael Kaufman. It's a very complete and professional publication backed by research and oil analysis. You will see that synthetics can and do out perform Dino oils significantly. The 3 million $ question is......can a real car guy go 7,500 to 10,000 miles on quality synthetic oil without getting the urge at 3000 or 5000 miles to change the oil? If not.....Synthetics are probably not for you unless you drive in VERY cold or VERY HOT conditions (towing). If you really want the answers to your oil questions.....get the bible.
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