04-08-2011, 09:54 AM
So my friends 600rr hit the crank bearings on #2 and 3. Did not run outa oil it seems. Crank had some strange black burning marks running from the journal in the direction of crank rotation. A older mechanic said its because we run normal multigrade 20W50 oil and not full synthetic. Now the 2 questions are:
1: Would full synthetic automobile oil work. (From good manufacturer)
and
2: Heard alot of mixed feelings about just changing to full synthetic. Things about oil not mixing and seizing the engine. Others say I must use a flushing agent to first flush the motor. Then others say I will hurt my gearbox and clutch plates with the flush.
So WHO the F#CK is right? I dont wana seize my crank too! Luckily his crank was just polished and measured up a-okay.He needs new bearings now.
Any and all advice would be cool!
1: Would full synthetic automobile oil work. (From good manufacturer)
and
2: Heard alot of mixed feelings about just changing to full synthetic. Things about oil not mixing and seizing the engine. Others say I must use a flushing agent to first flush the motor. Then others say I will hurt my gearbox and clutch plates with the flush.
So WHO the F#CK is right? I dont wana seize my crank too! Luckily his crank was just polished and measured up a-okay.He needs new bearings now.
Any and all advice would be cool!