On Fri, 4 Apr 2008 12:44:21 -0700, "er@[EMAIL PROTECTED]
" <nobody@[EMAIL PROTECTED]
>
wrote:
>I only put about 3k miles per year on my Z4. Is it necessary to change
the
>oil once a year? I wouldn't think so but I spoke with someone who said
they
>change their oil once a year regardless if 5k miles were driven.
>
It not the oil that deteriorates so much as the amount of water that
ac***ulates
in the sump when starting from cold.
this is something that people don't consider - that is the effect of
condensation. One only has to look at the inside of a windscreen
(wind****eld) on
a cold day and watch it mist up or look at a pan of cold water being
heated on
the hop - the condensation running down the outside (metal pans mostly).
Think of the pistons - alloy and cold then consider the heat on the top
and
thing about the water droplets dripping into the oil and if enough finding
their
way to the sump pan. One day - if enough water is there the oil pump will
pick
up water instead of oil and water is not a very good lubricant unless you
have
nylon bearings!
Just a thought -------------------- or you could simply take it for a 50
mile
drive once in a while to eva****ate the water before they get to turn the
oil a
slimy chocolate milk shake colour and constancy - usually referred to over
here
as oil mayonnaise. In the 1960s and 70 Vauxhall (UK GM) had to make mods
to the
small 1200cc engine by fitting a deflector that ****elded the valve cover
from
the cooling fan. It stopped the mayo forming but often it was fitted too
late to
prevent damage.
Hugh
--
Sir Hugh of Bognor
The difference between men and boys is the price of their toys.
Intelligence is not knowing the answer but knowing where and how to find
it!
Hugh Gundersen
hsg@[EMAIL PROTECTED]
Regis, W.Sus***, England, UK
