The increased additives that are not needed for the Gasoline engine can also
help to coat and foul the O2 sensor and catalytic converter. Actually things
are not that simple. Thanks to newer Diesels (2007+) having exhaust after
treatment and the ultra low sulphur Diesel fuel required for them the newer
Diesel oils are getting less ash and zinc as additives and these oils are
now also getting listed for Gasoline engines. You want at least SL on the
label with SM being the latest spark ignition standard.

While outside temperature has limited effect on oil temp unless the cooling
system is stressed, engine speed and load does. For that occasion where
extended speed or load pushed the oil system to the limits of maintaining
pressure, I want that "50" oil in there to provide any reserve possible, at
least for the water boxer. My VW Fox, Audi A8, and Benz 600SEL get the Mobil
1 European formulae, 0w-40.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Jake de Villiers
Sent: Saturday, May 22, 2010 5:42 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: oil other than Castrol

Hey Dave, 15W40 is truck oil and as such has a much better additive package
that the 20W50 car oil you've been using.

If you had an oil pressure gauge, you'd notice that your pressure drops off
much less with mileage accumulation than it does with the car oil.

I love Shell Rotella T  15W40 and use it in almost everything...

On Sat, May 22, 2010 at 2:02 PM, Dave Mcneely <mcneely4@cox.net> wrote:

> ---- Scott Daniel  - Turbovans <scottdaniel@turbovans.com> wrote:
> > for a weight, 15W40 is what I use, almost exclusively.
>
> > I have used a lot of Chevron Delo 15W40...
>
> > anyway....15W40 in a quality brand does it for me.
> > Scott
>
> Scott, 15W-40 may work fine where you drive.  I drive in well over 100 F
at
> times, and so prefer to stick with the 20W-50 that is recommended by VW
for
> summer temps.  You are satisfied with results you've gotten with Chevron
> Delo.  Do you know if it is available in 15W-50?  Guess I need to look
> about.
>
> Thanks for your commentary.
>
> David McNeely
>

--
Jake

1984 Vanagon GL 1.9 WBX 'The Grey Van'
1986 Westy Weekender/2.5 SOHC Suby 'Dixie'

Crescent Beach, BC

www.thebassspa.com
www.crescentbeachguitar.com
http://subyjake.googlepages.com/mydixiedarlin%27