WayneTuttle wrote:
If you were driving a car at 100 MPH for 325 hours, it would only be 32,500 miles...
The engine wear is worse because of the crankshaft torque-loading of a boat, but the spark plug wear is not worse than a car.
I agree. The only concern I would have is with corrosion on the external section of the plug. If the plug shows signs of corrosion, replace it. I had an old Sea Ray that I changed the plugs on it shortly after I purchased it. Three out of the 6 plugs broke due to corrosion. I had to use a reverse screw extractor on it. I imagine the plugs haven't been changed in 10+ years.
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