ated 96-03-15 06:59:32 EST, gmccann@pcug.org.au (Graham McCann)
writes:
>The MGB GT V8 manual in fact specifies the use of 80W/90 oil
>in the gearbox (and they all had overdrive) and you will find that Triumph
>and Jaguar specified 80W/90 for overdrive models. Some people here use Auto
>Transmission Fluid with considerable success, although I tend to stick to
>the manufacturer's specs.
The V8 had newer and befier syncros, assumable not brass. Brass syncros get
eaten up by EP oil byproducts. I would be most surprised if the overdrive had
actually spec'ed 80/90. There was a debacle in the 70s over oil, sometime
after British (Phlem Sucking) Leyland took over, at one point they sent a
service bulletin to the states saying 80/90 was ok. About 6 months later said
bulletin was hastily retracted and warranty claim recalls were issued to
change the oil back. I worked in a Brit shop at they time...
TR and Jags use different parts than MGs. (I noticed?) TR spec'ed engine oil
for all gearboxes until they went to steel syncro rings, (later TR6) and
Still spec'ed engine oil for gearboxes with OD. The Swedish cars that use
Laycock overdrives (same as ours) spec engine oil to this day.
Some shop manuals including Chiltons have incorrectly given specs for Brit
cars including gear oil in boxes.
The bottom line is to look at what they said when they made the car. It makes
no sense to screw around with different oils and risk damaging expensive
parts when the original application worked just fine.
AS for ATF, when you find a torque converter in a 4 speed, then use ATF.
Otherwise, that's sheer sillyness. Think about it, would you use it in your
motor? Auto trans don't work like manuals, thats why they need a different
lube.
Back to 20W50, folks. Use what works right.
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