Hello. I have a slight engine oil leak on both 6.2 engines. About 430 hrs each engine. Oil seems to leak a bit when it’s hot after a day of boating. No oil being slung up on hatch mirrors. I just see a small oil splatter in the bilge under the front right side, looking at the engines. Oil filters and lines do not seam to be leaking. Anyone else have to deal with this. Any advice or suggestions would be great. Thanks.

For troubleshooting first I'd get a rag or paper towels and some simple green. Clean EVERYTHING you can, Lines, ends, adapters, every. thing. take paper towels along the hoses. It's a lot easier to find issues when it's clean/new. After you go for a 5-10 min run, take paper towels along the same hoses, oil leaks start high then cling to whatever as gravity takes over. The oil hoses are under pressure, and if not tight enough can leak too. after I put the new engines together, the lines took more torque than I expected with my hand/mental torque wrench. Another 1/4 turn or so and it was good, but obviously don't break it / damage it.

Mine (292 with 350s) had a similar issue.
I'd clean everything, but after a run I'd have oil in the bilge again. Seemed never ending. Even followed me to new engines, so I knew it wasn't the 'engines'.

Mine had a leak on one or both before I replaced both base engines.
Even had a shop replace the lines on port and it didn't fix the oil leak.

Issue for me was the adapter from the lines to where they meet the block. The lines where leaking.

on my 350 it's the 13, 10, 11, 12 parts assembly that was leaking
https://www.marineengine.com/parts/m...067N1/4848_260

it's a lot easier to find the leak with the engine out of that tiny bilge lol. I replaced the adapter when I had easy access to it.

Not sure if you can get to it with the engine in.
But I'm usually the sucker being asked to pull starters for inboards for people.

if I recall correctly, my final leak was between 9 and 12, the shop used aftermarket lines, and I was less than thrilled.

Also had a small leak between 8 and 1 or maybe 9 and 3. I think after messing it with for a few years, was good for the 2021 season.
Of course my trim pumps were another story, but those have been replaced now.

Looking forward to a clean 2022 season!

Thanks for the excellent advice. The more I think about it with the oil being hot and higher rpm after a day of boating the oil leak shows up in the location described. Sounds like that is the probable cause.