Marine Power 4.3 VORTEC MPI Owner's Manual page 20

8.
Engine Operating Instructions
Marine Power considers the first ten (10) hours of
engine operation to be the break-in period.
During this break-in period:
Do not operate the engine at wide-open throttle.
Do not operate the boat at or near the maximum
capacity specified on the USCG label.
Limit the maximum engine speed to 3500 RPM
Avoid running the engine at a constant/steady RPM for
sustained periods of time. (i.e. vary the throttle/engine
speed frequently)
Check the engine oil level at the beginning of each
boating day, and after each 2-3 hours of engine
operation. Any time oil level is checked look for milky
discoloration, if found consult with your dealer.
After the first ten (10) hours of engine operation but
before twenty-five (25) hours return the boat to your
dealer for its first engine oil and filter change and initial
engine inspection.
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