> Question: I have a car that has 178K miles on it. It still runs
very
> good. Would it help or hurt to put Amsoil oil in it. I have been
> using Castrol GTX for quite a while.
>
It's never too late to run a good synthetic engine oil, with AMSOIL and
Mobil1 the best and next best candidates by all measures, according to the
exhaustive "'More Than You Ever Wanted to Know About Motor Oil', the most
recent (July 11, 1999) version of which is found at
http://www.micapeak.com/info/oiled.html. According to this impartial
summary, "The synthetics offer the only truly significant differences, due
to their superior high temperature oxidation resistance, high film strength,
very low tendancy to form deposits, stable viscosity base, and low
temperature flow characteristics." Please compare the figures given there
between Castrol GTX and AMSOIL motor oil.
The only accounts I have seen of leakage or any other problems ascribed to
the use of sythetic motor oils also mentioned the use of a far too thin
grade (i.e. SAE 5-30 or 0-30, where at least 10-30 or higher was actually
recommended by the manufacturer). Use the correct grade for your vehicle
and you will have no problem.
Although you do not mention the actual make or type of vehicle above, I
would also highly recommend with a higher-mileage automatic transmission
vehicle, if you really want to extend the life of your daily driver, that
you have the automatic transmission's filter replaced and the tranny's
"bands" properly checked/adjusted (perhaps for the first time ever?) and
then run the AMSOIL automatic transmission fluid suitable for the vehicle.
A link to an online catalog and ordering for the whole line of AMSOIL
products can be found at near the top of the "AMSOIL for Amphicars" catalog
at
http://www.carstrucksvans.com/amsoil. This pampering combination might
very well see your old reliable jalopy through a quarter of a million miles.
By the way, the AMSOIL Metal Protectant Spray ain't bad either...It's rather
like an easy-to-apply version of that British WaxOyl stuff that folks rave
about...and particularly well suited to the "winterization" of Amphicars.
For more on that topic see
http://www.geocities.com/soho/8389/winterization.html.
~Bilgemaster~