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Re: [T3] Forward creep in neutral


On 18 Nov 2004 at 0:23, David V.N. wrote:

> From: "Jim Adney" <jadney@vwtype3.org>

> > On 17 Nov 2004 at 20:21, C.Rochambeau wrote:
> > 
> >> > Change the oil to a synthetic.
>  
> > I also don't know that there is any real advantage to synthetic in this 
> > application.

> I can agree with that.It certainly didn't appear to make any difference in
> engine oil. Or so it was with my little experiment with it.

It is my understanding that in long term tests the synthetic engine oil has 
demonstrably better properties due to the fact that its additives do not break 
down with high temps and shear the same as dino oil additives do. It's not 
surprising that most of us can't see these effects because they only show up in 
the very long term.

The dino oil itself does not break down and can be re-refined and reused.

The advantages of synthetic oil completely disappear if you don't have a full 
flow engine oil filter. Unless you have a full flow filter, you MUST change 
your oil regularly just to get rid of the suspended wear particles in there, so 
the longevity of the synthetics becomes irrelevant.

In a manual transmission there is almost no heat stress, compared to an engine, 
and most of the shear has been replaced by rolling element bearings (ball and 
roller bearings) so I don't see these advantages being important there.

There's probably an advantage to switching to a 75W-90 over a 80W-90 or just 
SAE 90 gear oil, but that would depend on your climate. I was probably wrong in 
suggesting 80W-90, just because that was based on very old experience. It's 
quite possible that 75W-90 gear oils are the standard today.

-- 
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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