Re: [VN] New Mobil1 vs. Old Mobil1 vs. Non-Synthetic?

[Mark Romans <romans@pacbell.net>]

I would be concerned about running straight 20-50, GM specifically says not
to use 10-40 or 20-50, 5w30 or 10-30 is recommended.  I follow JR's advise
and mix the 10w30 and the 15w50 Mobil 1.
I am afraid that 20w50 might contribute to cold start wear.  Of course if
you have just run the wheels off it since you had it?  Had fun though huh?
Mark
-----Original Message-----
From: Michael Adams <michaeladams1@compuserve.com>
To: 'GMECM' <gmecm@diy-efi.org>
Date: Monday, January 24, 2000 6:30 PM
Subject: RE: [VN] New Mobil1 vs. Old Mobil1 vs. Non-Synthetic?


>I hate to be the one to throw water on the synthetic fire, but let's
>remember that synthetic oil cannot work miracles.  I have an '85 Buick
Regal
>that has had 20-50 Mobil 1 synthetic in it since about 20,000 miles, up to
>its current 102,000.  The oil and filter were changed every 4000 miles.
The
>engine, frankly, is getting noisy.  In fact, I am a little disappointed in
>how noisy it has gotten considering the expense of Mobil 1.  I am not
>running a fleet, so I cannot attest to the value of using synthetic
>lubricant, but I have had engines with non-synthetic oil which lasted
>better.
>
>Synthetic, no doubt, is better regarding engine deposits, and thermal
>breakdown.  It's value for reducing wear in on the road conditions (ie. not
>racing), however, is questionable in my mind.  In fact, I have not seen one
>good fleet test with a true A/B comparison, with one set of cars running
>synthetic, and the other running non-synthetic, under the same usage
>conditions.  If someone has seen such a test, I would be interested in
>seeing it.
>
>Michael Adams
>'89 Coupe 6-speed Z51
>
>> People are getting 200k+
>> miles out of everything from VW's to 'vettes to Subaru's using regular
>> organic oil simply by keeping to a good service schedule.
>> Synthetic gives
>> you extended drain intervals, a wider operating temperature range, and
>> overall lower internal friction. Going from $1/qt to $3.50/qt
>> to get this
>> is worth it. Going from $3.50/qt to $10/qt for Redline isn't, to me.
>
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