Engine shot oil out of the fill hole... Volvo Penta D2-40

[HUFFnPUFF]

So I changed my oil on both sides and replaced the oil filters.

The port engine works great. No issues. The starboard engine blew about 3 qts of oil out of its drail hole and had significant pressure in about 4 seconds... just long enough for me to run and turn off the engine. I could hear the air hissing out of the drain hole Sent the oil flying. Any ideas or suggestions?

[Turtle Blues]

Are you absolutely certain of the correct volume out and back in? Sounds like over filled. Would drain completely and do it again.

[FPNC]

Perhaps you mean the fill hole? If so. Excessive blow-by. Worn rings.

[Bill Seal]

Changing the oil won't suddenly destroy the rings,
Putting on a spin filter without making sure the old rubber gasket isn't still on the block is guaranteed to make a mess.