Perhaps not terribly helpful but in the U.K. my 1965 Series 2a Landrover is tested against the emission standards it was built to, which is
"the smoke from the exhaust must not obscure the vehicle behind"
and I expect to be able to tax it ad finitum( it's on a galvanised chassis)
I haven't a clue if Spain is different.
P.S. It doesn't smoke all that much before I upset someone.
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