OK Thanks everyone.
I'm Happy to keep using the 10W -40 and now I know the most important number is the 40.
The Gulf Western is a CJ-4/SN and specifies it's safe for soot ovens.
So should be fine.
Now just gotta keep shopping around for ATF. Don't want to trade my left nut for a 20 L drum. I'm happy to wait a bit longer.
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Cheers
Robbo
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