
The engine is old and tired anyway, it's had low oil presure and low compression as long as I've had it which suggests big end wear and piston ring wear to me too.
I think the smoke was from the overheated thin oil escaping from old seals and dripping on the hot exhaust rather than being burned and blown out of the exhaust.
I'll drop the oil anyway as part of the engine out manouver, it'll be easier to drop it with the engine in the van than with it on the bench anyway. I'll report back on anything I find in the oil

I knew this would happen eventually but due to my wife being terminally ill we decided to just use it as long as we could and deal with it when it happened. It's done us well considering.
Unfortunately it's happened at a bad time for us as the wife has taken a turn for the worse recently and we wanted to make the most of the time we have together by getting out and about in the van. She's on oxygen 24/7 but we can take her oxygen tanks in the van and plug in her oxygen concentrator as long as we have hook up.
Thanks for your kind words Roger. We're off to the beach for a day trip in the car today, not the same as taking the van but needs must.

(update)- i just went out and put it up on ramps while I can still drive it, it's pissing out water from several seals, thermostst housing, bleed ring to block under the alternator and i think head seals too. whether this is due to overheating? barrell fire seals gone and gasses pressurising the coolant circuit? or the cause of the overheating? I don't know.