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On the newer cars, honda recommends 5w20 and so forth. On the older cars, 5 or 10w30. As for my cars, I use Mobil 1 synthetic without the high mileage crap. I use Fram Toughguard oil filters and change my oil every 3000 miles, too. I haven't had a problem with leaking. I've heard that the detergents in the synthetic oils clean out the gunk that builds up from the non-synthetic oil. These days, there is just as much detergent in either type of oil. I have seen better mileage with the synthetic. The more you keep the oil in the engine, the more chance it has at accumulating 'crap' in that time. By the way, I have a 97 Civic, an 05 Accord, and a 92 F150. No problems yet.
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IYAOYAS
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