Hi, In today's engines, oil vapors (that could create too much pressure in the carter) are sent back to the air admission, then condensated in a so-called intercooler. The intercooler then rejects (small quantities of) oil into the bilge. No atmospheric pollution, that's OK. My question is : how much oil rejection is tolerable from the intercooler, for a young Volvo D2-75 engine (less than 1000 hours) ? When do I need to be concerned by a potential problem in the lubrication system ? Does anybody have insights or similar experience ? Thanks / Michel on Velvet.