A mate has 'seen a letter' from a chemist working for an oil company stating that to add 1/2% by weight of either old engine sump oil or old gearbox oil to A1 will make it the same as diesel.
He has run his troop carrier for years by using (contaminated-drained from the wing) A1 without problem. Reckons going up a hill under load a lower gear is required.Thats all.
Mariner also make K outboard engines. Start on 130 (i mean petrol) and then above idle switch to A1 (i mean 'K'erosene). 30-1 oil mix though.