bmw e93 325i sport servicing

[Chan61922]

hi guys thinking of servicing my 325i, just wondering what grade oil you guys are using in yours, all of my previous bmws ive religiously used castrol edge 5w 30, i phoned my local bmw dealer the other day for a quote on bmw oil, i was quoted 20 something quid a litre, sod that!! i then asked what grade he was refering to and was told my car takes 0w 30? he recommended castrol 0w 30. just tapped in my details on euro car parts and every oil is showing 5w30 but catsrol is showing 0w 30? do i go with the catrol 0w 30 or shall i just buy my usual 5w 30? i understand 0 w 30 is thinner in cooler temps, but summers not far off so what do i do?
also looking at some new spark plugs, do i go with bosch or ngk? think bosch ones are slightly cheaper, but the list price is more then the ngk.

many thanks

[Chan61922]

Think I'll stick with Castrol 5w 30, any thoughts about new spark plugs? My car is the defined 3 litre engine, n53 engine, I know they commonly get coil injector faults, at the min the cars running sweet, and I beleive it's had a new 02 sensor last year, I only bought the car in January. Just want to give it a good service for peice of mind, the dealer i bought the car from did service it prior to sale but I know they would've used rubbish oil and plugs, so a once over makes sense. Do you think changing plugs might upset coils and whatever else the cars notorious for failing on?

Cheers

[Chan61922]

Sorry de-tuned 3litte engine* lol

[Chan61922]

Sweet I was just going by if it ain't broke don't fix it. Didnt want to upset anything in the process, I'll go ahead with it just out of curiosity what are you guys averaging fuel wise in the 330i? I've got an auto 325 seeing high 25- high 26, mixed driving, mostly town and a lil motorway blast to work.