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Date: 12 Jan 1999 03:06:57 GMT
From: Bunny Buster <rthomas278nopsamdnet.att.net>
Subject: Re: Any 300K miles engine around? Need real data...


Boats run at varying speeds, ships at more constant speeds. David Everson wrote: > > Ken Washington wrote in message <369A3F8D.A93nopsam.net>... > >Dave, > > > >You try to make a BMW sound like it is from another planet. The bottom > >line is that it is an automobile that in most cases burns gasoline > >(petrol) for fuel and uses oil as a lubricant. Take the wheels off and > >weld on a hull with propeller, and you have a boat. BMW's, like anyother > >car, truck, boat, plane or machinery is subject to wear from friction. > > 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? > > Dave is right, oil manufacturer's do not intend their products to be used > with additives, to the extent that many oils contain additives already (such > as Castrol GTX Magnatec). Modern semi-synthetic or fully-synthetic oils do > not degrade with time as much as old mineral oils do. They also retain their > grade and viscosity at high engine temperatures better. > -- > from Dave :-) <davidnopsam-ME-NOTbootsorion.demon.co.uk> > Make obvious correction to reply > > He who dies with the most toys... wins!

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