I have an 88 100 horse Merc outboard, oil injection. It seems to be
injecting oil at the rate of 1 litre every 1 1/2 hrs of operation. Manual
says the 4 litres should last 18 hours at WOT. It is not leaking out and
the motor is not emitting any visible smoke. It seems to run normally. The
motor is a recent purchase and I don't really know if this is a sudden
development or not.

Possibly related: Temp gauge only lifts off of 60F a bit when I boat in
warmer water. Usually it doesn't move at all. This is either a bad temp
sender or bad thermostat which causes motor to never really get warmed up
properly. Would a stuck open thermostat cause excessive oil consumption? Is
there an adjustment that can be made to the oil injection pump?

Any advice is appreciated. Vacation is coming and I don't want to tow the
boat 100 miles to the mechanic if I can avoid it.

--
Denis Roy
D. Roy Woodcraft
www.ideasinwood.com