By weight is how oil and most other substances are analyzed (water being
an exception). PPM = mg/kg
To analyze, you have to start with a set quantity, usually done by
weighing out an amount. And it doesn't matter from a comparative
standpoint anyway so long as the same units are being used.
David Councill, former chemist
64 B
67 BGT
72 B
-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
Behalf Of Max Heim
Sent: Monday, September 21, 2009 3:00 PM
To: MG List
Subject: Re: [Mgs] [Mgb-v8] Kendall Oil
Well, they (Kendall) have spec sheets that show zinc and phosphorus
content
as a percentage of weight, which is essentially useless (how much does a
quart of oil weigh? It's sold by volume...). Are they being deliberately
obscure?
I looked at the sheet for GT-1 High Performance Motor Oil. It said the
20w50
grade ONLY had "additional" ZDDP, but it didn't say how much, and the %
figures made no distinction between grades. At any rate, it can't be a
significant amount, since it stated the oil still meets new car warranty
requirements.
What we are looking for, essentially, is an oil that DOESN'T meet new
car
warranty requirements (i.e. too much ZDDP for the catalytic converter to
handle). This is the problem -- who would market such a product?
Specialized
outfits like Brad Penn, I suppose.
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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