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For personal interest sake I made some enquiries only to find out that in the USA Mobil 4T is configured at 10W40 and in warmer climates (such as Aussie) it is 15W50. According to the Aussie Boss Hoss dealer he spoke to Nesco Jim first hand and was advised that Nesco had no problem with the 15W50 and that is what us outlanders should use.

Let us know if you have a problem with that ok?

I have no problem with that it doesn't affect my bike at all if you run excessively thick fluid in Australia. I would expect though that areas with tight clearances will get poor lubrication and it will take longer for fluid to apply and release clutches.

Shane