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Originally Posted by Airforce7704
ok i have a ?. mabe someone can help. my ninja has 31,000 miles on it. synthetic oil was never used on it. i was going to put it in there the next time around but i was told never start putting synthetic in a bike with that many miles. is that true? and if so where can i find non synthetic oil for it?
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That's an old wives tail , reserved for classic cars with old style fabric seals that already had poor oil control. Unless your bike was horribly neglected and the oil burnt and run way over change mileage several times, it should be fine. I bought my 91 Berreta GT at 185,000 miles, and started using synthetic when I bought it to no ill effect. It had 265,000 when I finally gave it away....
EDIT: you can buy dino oil from the dealer. I've read about others using regular car oil, 10W40 and 20W50, but I can't verify the results, so I don't suggest you do that.