I was always told that plain old SAE 30W was what you used for these inline
6's. Thats what I put in the 49.
----- Original Message -----
From: <ADvent@thuntek.net>
To: "Steve" <m_toolman@yahoo.com>
Cc: "Grant Galbraith" <trks@javanet.com>; "oletrucks"
<oletrucks@autox.team.net>
Sent: Monday, March 06, 2000 6:13 PM
Subject: Re: [oletrucks] Smokin 235
> I would avoid 10w40. 10W40 is actually a 10 weight oil with vicosity
> improvers and winterized. The improvers and the higher ash content will
> clog up your rings according to General Motors. It will void the new
engine
> warranty! I learned of this when I worked the parts dept. at a dealership
> in Arizona about 10 or 12 years ago.And if you have cast iron pistons, i
> would think about sticking to a straight vis. oil like 30 weight and 20
> weight in the winter in colder places.
>
> Steve wrote:
>
> > Grant
> >
> > Back in about 1980 (Gee has it been that long?) I was
> > finishing up the engine rebuild on my 63 Vette. I
> > contacted Mobil and talked to some of their technical
> > people. Their recommendation was to use "regular" oil
> > until the engine was broken in. They said they
> > experienced excessive oil consumption when trying to
> > break in an engine with Mobil 1. They also said there
> > biggest complaint from customers was oil leakage
> > (because oil is so thin).
> >
> > I would switch to 10w-30 or 10w-40 and see what
> > happens.
> >
> > Good luck.
> >
> >
> >
> > --- Grant Galbraith <trks@javanet.com> wrote:
> > > I have about 13 K on my 235 that was rebuilt with
> > > all new parts, bored
> > > with new pistons, cast rings and bearings as well as
> > > cam, cam gears,
> > > etc... I've noticed since I took it out of storage
> > > after a highway run
> > > it will smoke from the breather tube and vents in
> > > the valve cover so
> > > much so that smoke is billowing out from under the
> > > truck. I've always
> > > used 5-30 Mobil 1 synthetic and changed it again,
> > > the 5th oil change
> > > after noticing the smoke, still smoking. I know bad
> > > rings can cause
> > > blow-by but wouldn't expect it on such a recent
> > > rebuild. Any Ideas?
> > >
> > > Thanks, Grant
> > > 50 Chevy 3100
> > > 52 GMC 150
> > >
> > > oletrucks is devoted to Chevy and GM trucks built
> > > between 1941 and 1959
> > >
> > Do You Yahoo!?
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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