Anyone know what engine could use unleaded fuel?
Volvo Spain tell me that only models >87 can use it but my 360 was different from all others 360's that I know <87>87 but in documentation say thas was registered on 10-09-1986.

Right, that's an interesting one. It depends on the 'model year' not when it was built. They started building 1987 model years, halfway through 1986.

So if you got a really early one, you could have a model year 1987 car, registered in 1986.

This doesn't hold out for everything, but generally the 1987 and onwards cars will have a black oil filler cap on the rocker/cam cover and the earlier ones will have a metal cap.

If you pm me with your chassis number then I can look it up for you and find out for sure.

BTW no need to double post mate, there's not much we miss