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Join Date: Nov 2007
Location: Chandler, Arizona
Got to agree with KM again here. The 2 most important things about oil is using the right weight, and changing it often. If it meets the warranty requirements of new car manufacturers, it is safe to use. Synthetic oil will "last" longer than non synthetic oil, but it gets contaminated just as fast, so the fact that it does not break down as fast is really a moot point. It needs to be changed when it gets contaminated.
IMO, and this is my opinion, there are only 2 different weights of oil that should be used in any street motorcycle, 10w40, and 20w50. In the Philippines, I would definitely recommend 20w50. I would recommend 10w40 only in places where the temperature rarely gets above 32 degrees F.
As for changing it, the simple answer is as often as you can. Every 3,000 miles would be the max. Every 2,000 miles would be better, and every 1,000 miles would be great.
I live in AZ, which has the most extreme heat in the U.S., I use Mobile 1 synthetic 20w50 motorcycle specific oil in the Vulcan, and change it every 3,000 miles. That is a compromise. I use the synthetic only because of the extreme heat (115-120 degrees F), and because my bike tends to run very hot in city traffic in the summer. Any little bit of added protection will help. And even though it is a LOT cheaper here, I still can't afford to change it every 1,000 miles. If I lived in a place with more reasonable temperatures, I would use 20w50 Castrol GTX car oil, and change it every 1,000 miles. Jerry.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike