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The Croma 1.9 engine, although a Fiat design is actually a GM built unit under license.
An interesting theory. I have wondered about this myself. I haven't seen a Fiat logo anywhere under the bonnet of my 1.9 16v, other than the plastic cover over the engine.
I was going to change the oil myself, until I found out where you have to access on the blooming thing - did GM go out of their way to make it as difficult as possible, to keep their dealers in business? It couldn't possibly be anywhere less accessible. You'd be mad to try and do it without a proper ramp or pit.
I was planning an oil and filter change on my 8v 1.9MJ this weekend, weather permitting. Is access really that bad? What sort of tools would I need?