i see i see, i havent' had my car long and it's up for a 75 000 km service...i gotta do a fair bit to it..the general service, plus im doing coolant change seeing as though it's every 5 years you change ur coolant..i have a transmission/diff whine, transmission is a bit notchy and clunky or hard to get into some gears sometimes so im changing oil in both transmission and diff, i have an exhaust leak which i think is just a buggered U-bolt between the pipe and resinator...plus the possibility of a vacuum leak, however, i dont wanna have to pay holden to do all of that, it's gunna be a bloody expensive job that way, so doing some research and using my own knowledge i might tackle some of them myself, i might try find the vacuum leak (if there is one) myself seeing as though i know what holden will do (sorry, nothing wrong..or days/weeks of so called "diagnostics" which will not help me in the end, and i'll have to pay a **** load of labour)..anywho, besides attempting to find the vacuum leak im gunna do the exhaust leak...i'd like to do the tranny and diff oil change, except i haven't gotten a straight answer out of anyone on what oil is meant to go in them..ahh well, looks like i might have to pay up this time to get the work done..*sigh*..thanks for the help fellas, i'll probably do the vacuum leak later on when i have a few quid in the bank haha..thanks guys