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Date: 11 Jan 1999 12:04:42 PST
From: "Matt O'Toole" <mattnopsamanet.com>
Subject: Re: Any 300K miles engine around? Need real data...


David Everson wrote in message <916081636.8210.0.nnrp-03.c2def508nopsam.demon.co.uk>... >But a boat often runs at a continuous engine speed and load, unlike a car >engine which is subjected to continuous variable engine speeds and loads, as >well as the fact that when the Navy DO service their boats, I would presume >they get completely stripped-down and rebuilt, with all worn parts replaced. >Not exactly an option for the average car driver. >They often have shorter oil service intervals, for instance, my boat >requires an oil change every 50 hours, which at average speed is about 200 >miles (it's only a small fishing boat). My car requires an oil service every >6,000 miles. A bit of a difference, yes? Not really. Cars do operate at an average speed and load, which is what engineers ultimately use to determine how internal engine parts should be built, and what maintainence intervals should be. It just so happens that with a passenger car, these hour intervals correspond pretty accurately to miles, so either figure can be used. Obviously, boats and planes have wind and/or waves to deal with, so engine time may have little correlation to mileage. The same is true of construction equipement, etc. Boat motors operate under a heavier average load than cars', even if they do run at a steadier speed and temperature. But, if you look at most auto owners' manuals, they suggest halving the oil change interval for "severe" or "heavy duty" service. 50 hours at 60 mph equals 3000 miles, the oft-recommended interval for this "heavy duty" use. So, the maintainence intervals are not as completely different as you think. Matt O.

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