Doctor Evil wrote:
"The Natural Philosopher" wrote in message
...
nick smith wrote:
...........SSSNNIIPPP........
Synthetic oils only have an advantage in that they allow longer service
intervals with normal cars. Your post suggested they stopped wear in
abused engines at extremely low milages - so low the cars would still be
within warranty.
Please make up your mind.
--
*If your feet smell and your nose runs, you're built upside down.
Dave Plowman London SW
To e-mail, change noise into sound.
Dave,
I can't believe you just wrote that unless,
a) someone is impersonating you....then it wouldn't have been you
anyway,
b) you are bored and felt like starting a flame war
c) you have had several too many tonight....
Synthetic oils are WAY better than conventional mineral oils, both in
lubricity
and longevity
for starters. They resist temperature extremes better, both more fluid
when
cold and by getting
thicker at elevated temperatures by uncoiling their molecules.... they
are more
slippery to the extent
that in some wet clutch motorcycle engines ( and doubtless countless
other
applications) they are
excluded from being able to be used as the clutch would slip.
If they were little better then I am sure the manufacturers would have
been
rumbled and not
be able to sell enough of the stuff to make it viable, certainly not at
the
price they demand.
The bit about the suggestion that it "stopped wear in abused engines at
extremely low mileages"
is debateable - if parts are so slack that they are bashing themselves
into
oblivion then nothing
will stop that, but that's not my point or argument ...
Nick
It all goes back to my point, that, like gold plated litz stranded HiFi
cables, there are some advantages, but overall in most applications the
differences are so slight as to be totally not worth the extra cash.
Read my post on this, on startup protection.
I did, and really its was 99% ********.
Oil still exists around all bearings on a cold engine. If its really
cold, the manufacturer will recommend thinner oil for winter conditions
anyway.
The engine should be under almost no load, and, with modern fuel
injection, there is no advantage to starting on anything other than low
throttle.
That in itself is a far greater saver of engines than anything else.
Not that we were talking about engines till someone changed the subject.
There are as I already said no oil pumps in (most) gearboxes.
Fully synth oil is great for racing engines, but cooking engines are
designed to work on 'cooking' oil. They will as has been pointed out
outlast the car.
My brother in law has recently scrapped his trusty Vauxhall cavalier
after 200,000 odd miles and about 12 years of use simply because The
half a dozen things wrong - worn CV's, failing injections sensor
(probably) far exceed the cost of simply buying another equally tatty one.
You could indeed hear a bit of bearing wear on a cold start, but so what?
Other things had worn quicker.
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