its a 54 degree engine and yes firing oder is 1,2-3,4-5,6
http://calibra-classic.org/docs/vaux_v6_engine.pdf
but i did some mods on it it has cams from 3,0 engine so it breaths easier , fitted lighter flywheel .... so its now about 195-200bhp.
i think that its bad diesel here ,not maintenance, opel insignia and blows like hell.
as far as maintenance comes in question same parts are here like in your country.
in mine opinion you bought wrong car , i would buy an alfa with this beauty
no offense but when i see chip tuned diesel on motorway in reality i se this
chip tuned diesels mostly end up blowing black smoke while accelerating
something like this
but thats mine opinion and every body has one
i done this once, they build a new stretch of road 12km long and there's no traffic at all . so i hit 240 kmh its approximately 150 mh in mine opel calibra v6.
i dont know how do you feel about wauxhals here opel the first vectra in England cavalier was made as 2,0turbo 4x4 and they are easy to tune up from factory 204bhp but as a standard they are quite fast for 20+ year car and from outside they look as standard cavalier vectra till it blows you off...
gulietta is nice car , and its fiat underneath so i dont know i think its smaller inside then grande punto.
go for classic car if you like alfas spider is nice.or go for american muscle.
im from Europe so a little bit different cars here becomes classics for example opel manta 5 years ago had...