Can I point out that the term synthetic (when referring to hydrocracked dino oil) has been sanctioned by the
SAE and it's nothing to do with the Government allowing oil companies to get away with misrepresentation.
Secondly, don't get hung up on the weight of the oil - the weights aren't definitive, and as such one company's 0w-30 is another's 10w-20.
What you need to do is find an oil that matches the Class your engine needs, e.g. API SL/CF, ACEA A3-04/**-04/C3-04. (2.2
i-CDTi)
Fond fan of Liqui Moly - some useful/interesting info:
http://oelberater.liquimoly.de/liqui...sp?LANGUAGE=en
http://www.liquimoly.de/web/lmhomeen...ages/techinfos
http://www.liquimoly.de/web/lmhomeen...index_produkte