[Vwdiesel] cycling glowplugs

[Gerry Wolfe]

----- Original Message ----- 
From: <SLATERSFB at aol.com>
To: <vwdiesel at vwfans.com>
Sent: Monday, February 14, 2005 09:03
Subject: [Vwdiesel] cycling glowplugs


<snip>
 Up until this year I had always used 15w40 fossil oil & start up below zero
degrees F was always dicey. This year I switched to 15w50 Mobil One. The
coldest it has been here so far is -12F & I had no problems starting either
vehicle. With fossil oil, the pick up never would have started; Jetta,
maybe. I know that where you are temps get much colder than this, but
synthetic oil's gotta help.
... Bob in NY
</snip>
IMHO, viscosity of 15w40 fossil and 15w50 synth would be the same at low
temps (altho the synth prob'ly has the edge in ultimate low temp pour
point).
Also, I think the Mobil 1 is primarily intended for use in a gasoline
engines, used to be about CD level for diesels.  If yer looking for a
superior diesel synth oil, you would prob'ly be better off with a 5w40 or
0w40 diesel oil from Rotella, Mobil (Delvac) or Amsoil or similar.
I personally found a pretty big difference in winter cranking speeds going
from Rotella 15w40 fossil to Rotella 5w40 semi-synth.
Just my $0.02Cdn...

rgds, g.