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We're supposed to use motorcycle specific oil because, car oils have additives that could cause the clutch to slip in our multiplate wet systems.
The only bike I've known this to happen on, was our fleet Honda ST1100s. The clutches would always slip when used in anger because, we were using the same 10-40 oil that was designated for the fleet cars.
The original clutches on these bikes lasted about 15k before needing new plates. Once the fleet manager realised it was false economy, the oil was changed for bike specific and the clutches then went to 50k before needing plates.
I suppose anything specific to bikes is going to be expensive, due to the relative volume of sales of bikes and cars.
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