TDI = Turbo Direct Injection contrary to peoples beliefs, I think this name appeared in about '89 as older diesels did not have direct cylinder injection leading to high levels of knock and pi$$ poor performance.

SDI = Saugdiesel Direct Injection.

You'll be hard pushed to find a new VAG Diesel engine without forced induction.

Hmm my car is a TD (indirect diesel, turbo charged, no intercooler)

Hmm my car is a TD (indirect diesel, turbo charged, no intercooler)

:confused: I didn't say TDI had anything to do with intercoolers, quite the opposite in fact.

Any VAG car made in the 90's onwards with a TDI badge will have direct injection but may or may not have an intercooler. IIRC the Audi 90 was the first car fitted with a TDI engine whether that was a 1.9 or a 2.5 I don't know.