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  1. M

    Engine Oil

    1998 - Mercruiser 350 - V8 - 5.7L I/O Having a problem with engine oil and lower part of motor overheating. I have cleaned both risers (not bad) and manifolds. Port manifold replaced, starboard cleaned (very good flow). Oil pressure maintains 40-50 psi. Motor and oil both cool when rpm's...
  2. M

    temperature of motor at 3000 rpm

    1998 350 - 5.7 mercruiser - would like to know temp. of motor oil at or around 3000 rpm ?
  3. M

    Extremely Hot Engine Oil

    1998 I/O Mercruiser, GM V8, 350 - 5.7L . Engine oil became very hot, about 250 degrees at the oil filter. Prior to this problem the oil pressure was checked-out at 60 to 70 psi, new pressure switch installed, 15 Hrs. on oil and filter and I had no oil problems before this incident. Boat oil...
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