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have a 2002sts, owned it about six monthsm now has 92,312 miles on it, i change the oil around 3000 miles, does seem to take a quart of oil around 1000 miles of driving, and oil seems to be dirty to me, would like to put in a quart of risilene to clean it out before next oil change. would this hurt it? also will this engine run 200,000 miles? does run very good, i run corn based fuel in it, and gets around 22 mpg. will it run good on 87 fuel, should the milage be better? thanks Bob

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