[DML] Re: oil pressure (30 weight oil)
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[DML] Re: oil pressure (30 weight oil)

Use the word "correct" carefully:

In late 1984 Volvo issued a Technical Service Bulletin revising its
PRV oil spec to 30 weight. 40 weight was simply too thick for the PRV
oil passages, leading to premature bearing and camshaft wear. This TSB
was retroactive to the beginning of B-27 use.

Delorean Motor Company was of course out of the picture by 1984 --
they couldn't tell us themselves of such revision.

There is a misconception among DeLorean owners that the B-27 used
camshafts made of softer metal than B-28, and this is what led to
their premature wear. That is of course utter nonsense -- 2.7's
remained in production alongside the 2.8's in Douvrin. Cam heights are
different, but material composition is identical. Running too thick
viscosity oil is the culprit.

Each owner is free to run whatever weight oil he or she thinks best,
and there are as many opinions on the subject as their are weights and
brands of oil (with synthetic formulations now thrown in to liven the
mix), but consider this: Most 50 weight oils are marketed with the
words "racing" somewhere on the label. Bad news: The PRV as installed
in our cars is not a race engine. It is a family sedan engine,
identical to the Volvo 760, Peugeot 604, or Renault 30. Treat it as a
balding and paunchy middle aged father would, and you'll be fine.

Bill Robertson

>--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@...> wrote:
> With the correct oil 20/40 or 20 /50 and the right oil pressure
gauge that I
> sell and the idle at 900 or so you will normally hold about 30 to 40
> hot at idle and around 70 to 80 above idle as bitsyncmmater said. 
> If you run what the oil change places put in the cars it could be
5/30 or
> 10/30. At a 750 idle as the book say's hot you may not read any oil
> and who knows above idle. $36.95 for the correct pressure sending unit.
> John Hervey
> www.specialtauto.com


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