I recently picked up a 20 year old ATV. It is in great condition overall, but I would like to flush out the motor since the previous owner could not remember when the oil was last changed. It is the correct level and the previous owner said it was dealer serviced. My guess is the oil is a few years old.
Manufacturer spec calls for API SF or GF rated 10w40. Motor and transmission share the same oil, so it must be wet clutch safe.
I was thinking of getting SuperTech 15w40 diesel oil and doing at least 2 or 3 short OCI runs of approximately 15-30 minutes of riding. The ATV takes about 3.5 quarts per oil change. Each oil change will get a fresh oil filter as well.
Once the oil is looking good, I plan on using Shell Rotella T6 5w40 synthetic because the ATV's primary job will be snow plowing my driveway. I just hope synthetic will not cause a leak on a 20 year old stock motor.
Does my plan sound OK?
Manufacturer spec calls for API SF or GF rated 10w40. Motor and transmission share the same oil, so it must be wet clutch safe.
I was thinking of getting SuperTech 15w40 diesel oil and doing at least 2 or 3 short OCI runs of approximately 15-30 minutes of riding. The ATV takes about 3.5 quarts per oil change. Each oil change will get a fresh oil filter as well.
Once the oil is looking good, I plan on using Shell Rotella T6 5w40 synthetic because the ATV's primary job will be snow plowing my driveway. I just hope synthetic will not cause a leak on a 20 year old stock motor.
Does my plan sound OK?