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Thanks, JRMason. It was changed last fall, I wouldn't plan to do it yet. I was really wondering if it needed to be changed *based on* the 2 cycle oil intrusion...

Is the filter OK (is there a filter? I assume so) or do I need to replace that too?

Thank you, everyone. Unfortunately, we did run the motor for about a half hour. Hopefully I haven't caused damage.

I accidentally added 2 quarts of 2-stroke oil directly into our 4-stroke 100HP Mercury motor. It was not mixed with the gas – it went directly into the motor. The good news (I think) is that there was already a fair amount of 4-stroke oil in the crankshaft – it was about half full already. Do I...