alright guys just bought an st205 gt four thought id join the forum, and im after a bit of info as to what sparkplugs and grade oil and filter to use?

spark was a spark really on my saxo vts but that had spitfires on even so but im guessing it matters on these type of cars so is irridiums worth the money.
and what grade oil and decent make is best also fully synth or semi?

cars running around or cant be too far off 300bhp im guessing with the mods its got i had posted 240bhp on gt4oc but ive realised that was before the breathing mods and boost controller was fitted and everyone elses seems to make something around that area.
gratefull if any of you guys could help its my 1st turbo 4wd car so im new to all these turbo timers and boost controllers etc...
cheers
jim