Geriaviator,
Ah, the '48 Austin 16. The RAF had them in the '50s as a rather posh Staff car (all black and glossy). We had one, but that is a tale for the future !
Heavy engine (or gear) oil was what we used to put in our grease guns when we couldn't shift the dried gunge in the bearings of our old bangers.
I must insist in retaining my humble place in the ranks. This Thread should have no prima donnas; all contributions are of equal merit in my fanciful virtual Crewroom in cyberspace !
Cheers, Danny.