I added a remote oil filter kit to make my life easier. I now have about a quart and a half of oil in my bilge. This wonderful surprise came on my second day of running. First day had no issues, 2nd day oil all over bilge. Im running a Indmar 454, had 40psi at idle and between 60-80psi of oil pressure when running around 5,000 rpm. Checked filter kit and lines and they are dry and no leaks.  Noticed that my valve cover had some oil around it, but nothing out of the ordinary. Any, thoughts on where this issue might be coming from.

Oil drain hole in pan has a drain tube, checked and doesent seem to be leaking. Dip stick tube was siliconed in, but seemed to be loose, going to resilicone

I had an oil leak a few years back after a fresh build.  But the engine never leaked a drop during 30 minutes of break-in on my break-in stand (aka shipping pallet).

Like yours, the engine was loosing 1 or 2 quarts in the bilge every outing.  I incorrectly surmised that it was the main seal, so I pulled the engine and replaced the main seal - never mind that it looked perfect!!!

While bolting the pan back on, I decided to pull the dipstick tube to re-seal it.  That's when I found a crack in the dipstick tube, at the block where it's swaged (expanded).    It went about 1/3 of the way around the tube.  Must have cracked it when I reinstalled the engine after break-in.  It sure made a mess when the engine was running, and the source wasn't readily apparent, beneath the exhaust logs and all.  And it didn't feel loose from top-side.

Look over your dipstick tube really close when you reseal it.      Matt

Look over your dipstick tube really close when you reseal it.      Matt

Words to live by right there.....Siggy anyone?

  GT

Hey, thanks guys, looks like the dip stick might just be the issue. Going to reseal it and see what happens.....