My Vetus diesel has been burning a oil the last couple of seasons so I'm trying to figure out why. Here's my history with the motor.
2009 - first season with the motor for me. Motor is 10 years old but low hours (less than 500). Seems to run well, no oil consumption noticed for the season. A season is about 65 hours for me.
2010 - The guy who did some maintenance (me) on the cooling system failed to properly replace all the coolant. Engine overheated 15 minutes after launch. How hot?? Don't know. No temp gauge, the warning buzzer went off. Engine was shut, added more coolant and away we went. Changed oil just in case. Engine seemed to run fine, though seemed to hard to start when cold and burns oil. Engine burned 1/2 to 3/4 quart of oil through the season.
2011 - Still burning oil, slightly sooty transom. Burned 3/4 to 1 quart of oil during the season. When putting the boat away for the winter I collected some oil and sent it to Blackstone labs for analysis. Shows high wear in metals aluminum, chromium and iron. Lab suggests a stuck ring.
I guess i'm tossing this out there to see if anyone has any suggestions on what to do. I've not had a compression test done. I don't own a tester and don't have access to one. My boat yard does not have one. I know..I should figure out a way to have it one. I've been reading about little tricks to free a stuck ring like Marvel Mystery Oil/ATF or Seafoam additive. Could stuck rings affect compression? I'm wondering if I ran a compression test, then soaked the rings in some additive, then tested again I may have some data that would suggest that the additive is helping?
If it is indeed a stuck ring, I'm thinking that sounds plausible since the overheating could burn the oil around the ring to "stick" it?
Here is my oil analysis results: