Paul:
In the US there is one formulation of GTX available in a number of
grades.
A number of years ago I spoke with one of the Castrol Formulation
Engineers and he did state that the oils were specifically formulated
for US applications and did not meet the same guidelines as the UK spec
oils.
At the time (1979) the only readily available UK packaged oil was
Duckhams, which coincidentally was the only oil available in the US to
have met the Rolls Royce Company testing guidelines.
It made great marketing hype and perhaps there was a difference. At the
time we were very concerned about high levels of Zinc Dialkyl
Dithiophosphate causing problems with the new short bucket lifter in use
in the B series engines after 1972. We were experiencing only 40,000
miles before tappet face failure.
Kelvin.
-----Original Message-----
From: Paul Hunt [mailto:paul.hunt1@blueyonder.co.uk]
Sent: Tuesday, October 10, 2006 12:53 AM
To: Dodd, Kelvin
Cc: mgs@autox.team.net
Subject: Re: over drive oil
Can't speak for the US but in the UK at least GTX is sold in a number of
formulations - including one for modern injection engines and one for
older
or 'conventional' engines.
The crucial point to remember is that unlike modern cars the MGB is not
that
sensitive to oil in either engine or gearbox, although I personally
wouldn't
use a modern very low viscosity synthetic in either, these *are*
intended
for modern engines. There are synthetics for 'older' engines (Castrol
make
one under the GTX label!) but at the price I just don't see the value.
PaulH.
----- Original Message -----
Castrol GTX in particular has changed significantly over the years and
is specifically formulated for modern engines...
|