I usualy use diesel oil for the fist startups, as they are told to be better
for runnig-in. Is it only a industrial legend, or fact?
Never had running-in oil related problems soo far.
Gergo
2011/5/24 <Editorgary@aol.com>
> In a message dated 5/24/11 12:04:40 AM, coudesluijs@chello.nl writes:
>
>
> > I have never used "running in" oil but always primed the rebuild engines
> > turning over by hand first and then on the starter without plugs until
> > oil pressure was shown.
> >
> What is called "running-in oil" is simply a good high-grade, heavy-weight
> oil with a guaranteed high amount of ZDDP additive. Torco oil is one good
> example. In Europe, you may never have had the problem we had here for
> several
> years, when the oil companies were removing ZDDP from all of their regular
> oils and one of the consequences was that engine rebuilders were
> encountering
> problems with new cams being destroyed during the critical first 15 minutes
> of operation of the new engine, when there was no Zinc to bond with the
> Molybdenum to fill in the microcavities on the surface of the cam lobes.
> With
> more over-the-counter oils in the 15/40 and 20/50 range now with ZDDP
> additive again, it seems to be less of a problem, but the rebuilders I know
> still
> use the high-quality oil during that critical first hour or so of engine
> operation.
> Gary
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