[Mgs] Syntec 20W 50

[mghirsch at netzero.net]

You may have a misunderstanding of what the numbers mean.   A number like 5 or
50 describes the viscosity, or how well the oil flows.  Usually, the colder
the oil, the more viscous it is.  Viscosity is dependent on other factors than
temperature, such as moleular shape, stabilizers, etc., so that every liquid
has it's own rate of viscosity change.  As an example, the viscosity of water
varies very little from the freezing point to the boiling point.   Synthetic
oils may, depending on a number of factors, have a flatter vicsosity curve
than conventional oils allowing a range lilke 5w-50 or 0w-40 that conventional
oils cannot match.

My experience with Syntec has been very good, in fact I run 5W50 year round in
my V-12 Jag.

Maynard
---------- Forwarded Message ----------
From: Phil Bates <jello at cableone.net>
To: mgs at autox.team.net
Subject: [Mgs] Syntec 20W 50
Date: Wed, 22 Jun 2011 07:24:57 -0700

Ok, I edited in my HTML editor, and that's why I lost the content before.
Oops.

This thread may have hit the list before - but I found out this week that
Castrol
is no longer selling a 20W-50 Synthetic oil (Syntec).  I've been using it in
my
Lotus Elan, an Esprit.  I know some british car owners were also using it
because
it had higher ZDDP levels than regular Castrol GTX.  Unfortunately Castrol's
solution is that 5W 50 is the best replacement.  Well, it's not.  A cold temp
5 wt
oil is too thin for my cars, and probably several of yours.  Bottom line is
that I
now have my choice of Mobil 1 15W-50, or mail order for Red Line or Amsoil
if
I
want a Synthetic 20W 50.  I can do that - no problem, but a lot of harassment
to
me, as I used to pick up Syntec at the local Autozone.

Maybe if Castrol heard they're losing business to their compititors, they'll
reconsider.

For Castrol's comment on the change - see #8 on their website here:

http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/loc
al_asse
ts/downloads/f/Castrol_EDGE_FAQ.pdf

I can add that last night I changed oil in one of my cars.  As it was winter
when I
changed oil last, I had used Syntec 5W-50.  I did have some concerns with oil
pressure, but not major ones.  I had purchased enough Syntec 20W-50 for this
oil
change before it got discontinued.  I drive 30 miles to work, so my oil does
get
hot.  Oil pressure this morning was better.  Although it should be the same
hot
(they're both 50 wt hot), I had about 1/2 a bar (close to 10psi) more
pressure
before I pulled off the freeway.

Syntec 20W-50 will be missed, and I will have to go to another manufacturer.

Phil Batse
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