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Amsoil scooter oil in the Burgman 650 since it has a filter so I run long drain intervals.
Rotella synthetic in the SYM since it's cheaper and I run short drain intervals in the SYM due to lack of filter.
Bikes run at higher revs so tend to beat on oil. It's probably overkill really, but the cost difference isn't that much and overkill is better than not enough. I hate motor work..
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