Never been discussed before. We've never had an oil thread! Now I'll
clear the deck so the experts can speak. We need to send out a search
party for Larry T.
BTW, good questions!
jerryh--- via Mercedes <mailto:mercedes@okiebenz.com>
June 9, 2016 at 11:08 PMvia Postbox
<https://www.postbox-inc.com/?utm_source=email&utm_medium=sumlink&utm_campaign=reach>
It is my understanding that the EPA at some point mandated that a
mixture of zinc and phosphorus known as ZDDP (Zinc Dialkyl Dithio
Phosphate) be reduced or eliminated as an additive from motor oils
because it is damaging to catalytic converters. I am interested in
this issue because I have older cars (1960 Olds 1991 Volvo) with the
original gasoline engines, and I have a number of older quarts of
motor oil. I have a couple of questions about this:
1. Was zinc phased out of motor oil, and , if so, when was it eliminated?
2. Was it reduced/eliminated from diesel rated oil?
3. Is there a way to know from the writing on the can how much zinc it
contains?
4. Is there a way to determine from markings on the can the age of a
given can of oil?
5. Does canned/bottled engine oil have a shelf life?
6. Should a container of older motor oil be shaken to mix the
ingredients before being poured?
7. Would cans of "STP" additive from the seventies and eighties
contain zinc?
8. Is the "zinc" issue one I even need to be concerned about?
9. Would an old (70's era) can of racing motor oil contain a greater
amount of zinc?
!0. Might this topic have already been discussed in a previous thread?
Jerry
82 240D
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