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As the oring cannot seal the joint, the pump begins to suck in a little air and the air gets circulated into the oil galleries...If you raise the oil level a bit, the pump may not suck the air as much. The crankcase operates in a lightly negative pressure and that make matter worse. Replacing the oring is the solution. Keep the static oil level a bit higher than the operating range.
Thank you so much! I will get it replaced! Can you give a guesstimate on how much it will cost to replace it? Should I just get it done at the dealership?
if you dont have low or no oil pressure the o ring is not your issue. post a vid of said tapping, can be a huge help id'ing the tap. id suspect a lifter going bad if it goes away after a minute or two on start up, its just pumping up due bleeding off pressure when it sits. or if its a cold start knocking sound would be piston slap. once gain it goes away after a couple minutes of warm up time. i only hear the piston slap bs when its pretty cold out.
Agreed. I'm leaning towards o-ring being degraded and cracked. Also to boot, I'm speculating that 325K of use has lead to some carbon/varnish buildup. Since MMO seemed to help, try running a 1/2 quart of ATF the last 500 - 1000 miles of the oil change and drop it at 3k. Rinse and repeat if noise seems to improve. There was a thread awhile back where a guy in your situation did this process and had good luck.(I'm ignorant on finding old threads, but will post if I can find it)
