"Doctor Evil" wrote in message
...

snip

What degrades mineral oil a lot is the camshafts. They put enormous
pressure
on oil degrading it quite quickly. Once it looses its shear cam wear is
accelerated. Synthetics resist cam wear infinitely better than minerals
and
for all of the time the oil is in the engine.

Bollock, the largest reason for camshaft wear is lack of an oil supply, in
OHV engines camshafts often out-lived crankshafts, what often did wear was
the followers - but then they were *designed* to be sacrificial to some
extent.

With everything being top end
on an engine these days, on start up synthetics really benefit. Overnight
the oil drains down leaving the galleries and top end dry. The thin nature
of the oils means it gets to the bearings very fast. The cams are about
the
furthest point away from the oil pump.

You really are clueless about lubrication.


Synthetics are perfectly suited for diesels as they resist contamination
much better than mineral oils, and then all the other attributes which
have
already been mentioned. Mobil make a Mobil 1 for turbo diesels, as do
other
makers.

At the oil research lab I asked them about diesels and they also said
synthetics are better for diesels too. Now this was about 15 years ago,
and

Funny that, many manufacturers were telling people NOT to put synthetics in
their diesels around that time.... Again it comes down to what the engine
has been DESIGNED to use.

synthetics have come a long way since then too. They said one of the few
places for mineral oils was in slow revving ships engines, where the oil
and
engine were up to temperature and oil pressure primed before the crank was
turned, but only if the oil was regularly tested and changed immediately
on
degradation.

ROFLO, I can just see an engineer telling the Captain that it's ******** to
the force 9 gale, I have to change the engine oil !

Mineral oils degrade quite quickly once they go.

All oil does, including synthetics - hence why in high stress or cost
installations it's changed on duty hours (or even at every opportunity
regardless) or the oil is sampled and tested to find out it's true
condition.


Cheap supermarket oil has a place in the market? That may be the case of
the
"market", but not in any engine I know of.

Dropping the service intervals on a Ford is a good thing. Best not buy a
FixOrRepairDaily in the first place.


Oh, right, that would be why the Ford Transit is the largest selling light
commercial vehicle in the UK then.... IMM, you are an ignorant f*ckwit.