No subject

[Rick Cone]

Religion, politics and oil.  

The first question is what temps are you running in during the winter.  That would determine the bottom number for me.  The "if it ain't broke, don't fix it" part of me says stick with what you've been using.  
My friend Tony is an engineer with experience in oils.  He says the additives that make an oil multi-viscosity actually fight it's lubricative properties.  His recommendation is to run straight weight oil as much as possible, light in winter, heavy in summer of course.  He says to always run the oil with the narrowest spread between the numbers as it lubricates the best. 
Personally I run 15-40 diesel oil in every car but one.   It has more zinc and other stuff for high load bearing applications (such as turbocharging or track days).  I learned this from some motorcycle racers.  The other car is my 56 chevy.  It has 240000+ which is pretty good for an old inefficient american hunk of cast iron.  It gets straight 20 Pennzoil in the winter, straight 30 in the summer.  I would never recommend this oil to anyone, in fact it puts a bad taste in my mouth every time I do it, but that's what it's had in it since I Grandad bought it new, it had zero sludge in it when I changed the valve cover gaskets 15 years ago, and I'm superstitious to change anything now.
And just say no to fram, but you already knew that.


----- Original Message ----
From: Grant Lenahan <glenahan at vfemail.net>
To: 200q20v <a200q20v at gmail.com>
Cc: quattro at audifans.com
Sent: Sunday, February 24, 2008 8:01:50 AM
Subject: Re: 5W40 or 10W40 in 3B engine?

This is a topic  that will engender violent opinions.

But I firmly believe that the most important characteristic of oil is  
its ability to flow when cold.  Most damage occurs when cold.  Shear  
and starvation occur when cold.  Low viscosity defines the oil's  
ability to flow. This is a good thing, unless it should shear.

Furthermore, a 5W40 and 10W40 should have the same high temp  
performance- that's the "40" part.  yes, I'm aware that the spec s  
allow a 10W40 and 5W40 to perform differently at high temps, but its  
still fundamentally a 40weight oil when hot. A more useful m easure  
of its strength when hot is the HTHS shear number anyway.  This is  
best indicated by the presence or absence of the ACEA A3/B3 approval,  
which requires > 3.2.  Note that many oils that miss it are OK too,  
if they just miss it, like Mobil1 5W30 ( 2.9).

Either should be fine, but I would use the 5W40.

If you want more useful numbers than "XwY", look at an oil's data  
sheet and read the viscosity at 40degC (warm) and 100degC (hot).  
then think about what it is when its -5degC (cold)!

Grant
On Feb 24, 2008, at 10:17 AM, 200q20v wrote:

> Fellow listers,
>
> I have been using 10W40 http://www.amsoil.com/storefront/amo.aspx  
> since I bought my car in 03 (280k + miles now). When I got the 12  
> quart case last year I noticed that the label has changed (UPC code  
> has not) and there is no "Volkswagen 502.00, 505.00, 505.01" listed  
> on the bottle. I still used the case for all my cars but this year  
> I decided to do some more research and found that "Volkswagen  
> 502.00, 505.00, 505.01" is listed only on 5W40 http:// 
> www.amsoil.com/storefront/afl.aspx oil.
> Please suggest which one is better for year round usage including  
> one or two high speed events.
>
>
>
>
> _______________________________________________
> quattro mailing list
> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro
> ---
> Watch this space for ads :)

_______________________________________________
quattro mailing list
quattro at audifans.com
http://www.audifans.com/mailman/listinfo/quattro
---
Watch this space for ads :)


      ____________________________________________________________________________________
Never miss a thing.  Make Yahoo your home page. 
http://www.yahoo.com/r/hs