[Vwdiesel] Risks of straight weight

[Area31 Research Facility]

Do any of our oil chemists know what the dangers might be running non-diesel
rated, ordinary 10W30 motor oil in say a 1.6 Jetta TD in cold Canadian
winter weather 0 C (32F) to -25C maybe -30C ?

What is different about a lube oil formulation for a diesel engine than for
gasoline engines anyway?

Rob
Energy shortage?  Impossible!  In most of the developed world, the exception
being England, electrons literally swarm out of the ground.

----- Original Message -----
From: "Gerry/Joy Wolfe" <gjwolfe at telus.net>
To: <vwdiesel at vwfans.com>
Sent: Wednesday, October 05, 2005 1:03 AM
Subject: Re: [Vwdiesel] Risks of straight weight


> To quote Bentley...
> A2 diesels can use 15w40 about 0F thru 85F, minimum CD quality for a TD.
>
> My understanding is that (say for a 15w40 oil) the base oil would be a 15w
> and would have viscosity improvers to make it look like 40w oil when
really
> hot.  Generally, the closer the numbers are, the fewer viscosity improvers
> and the more real live lubricating stuff.
>
> A question for the experts:  What percentage of the total volume of oil
> would viscosity improvers have to be to make a a straight 15W oil look
like
> (15w)40 oil.  1%???  60%???  If it's only 1%, then there is still 99% of
> lubrication available in the mix.  If 60%, then I would guess the oil
would
> only have 40% of the lubricating capacity of a straight 40W oil (ignoring
> any lubrication aspects of the additives).
>
> Far as changes are concerned, oil doesn't really "wear out", but the
> additives do get chemically neutralized and the soot accumulates.  IMHO,
> 'specially with a diesel, using a "cheaper" oil (meeting/exceeding the CD
> requirements) and changing it more frequently is better than using an
> overkill synth and not changing it as frequently.  This proved out to me
> recently... had to have a head gasket changed at 275K km and consequently
> had the head overhauled and a re-ring... there was virtually no
wear/ridges
> in the cylinder walls, even the mechanic was surprised.  I do changes
every
> 3 months, Rotella 15w40 dyno.
>
> Other hand, synth oil does a better job handling a hot turbo on shutdown -
> less prone to coking i.e. converting liquid oil into solid carbon (doesn't
> lubricate nearly as well next startup).
>
> Just my $0.02 Cdn...
> rgds, g.
>
> ----- Original Message -----
> From: <LBaird119 at aol.com>
> To: <vwdiesel at vwfans.com>
> Sent: Tuesday, October 04, 2005 08:19
> Subject: Re: [Vwdiesel] Risks of straight weight
>
>
> > And for what its worth...What do you folks run, and at what temperature
> > ranges?  I've been running 15W-40...mainly because that's what I can
find
> > that's diesel rated... in a hurry at the station.
> >
> >
> >  I've always run Cennex 15W/40 year round, even when it's -20F.
> > That doesn't happen much anymore but other than slighlty slow
> > cranking on the COLDEST mornigns it does fine.  Pour point is
> > the real thing on cold starts and it has a lower one than a lot
> > of "thinner" oils.
> >    Loren
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> >
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