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Yes, this is a standard threaded plug and it may be very tight. Be sure you use an exact match on the plug with a 6 point socket. Hope that helps. Please get back to me if you need more later as all follow ups are included. If you are NOT using Onan oil, I would use Delo 10-40.
Just checking back in here to see if you got all you needed or do you still need some additional input from me?