not "any" oil. motorcraft api spec "semi-synthetic" makes the seals on
my 89 civic leak like sieves. subsequently running castrol or mobil
oil, i've had no leakage problems from the same seals whatsoever.
first line oil analysis is spark spectrometry. [quick and cheap.]
that's good for inorganic components like zinc, but useless for organic
component analysis. on spark analysis, motorcraft oil appears to have
an inorganic additive package just as good as other oils. but if it's
causing leakage, clearly it's missing organic components like seal
conditioners - and this would never show on spectrometry. guess that's
why it's cheap.
On Thu, 10 May 2007 17:40:40 +0000, Don Enderton wrote:
I don't know about the Service Specs, etc, but I have been using Castrol
for over 25 years and have 3 High Mileage cars.
Also, I picked up a Supra a couple years ago, and the vale stem seals need
replacing. Big cloud of blue smoke on startup. Started using Castrol High
Mileage..no more blue smoke. After the next oil change I'll switch back to
If you can do your own changes, do it. They're easy. They don't cost a lot
less, but you'll get what you want for oil and filters.
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