Which is the best motor oil ?

Hello,
I'm owner of a '98 Primera GT , and my question is ,
which is the best motor oil for this car ?
both the brand ( mobil1, valvoline, Castrol..) and the
number ( 0w50, 5w40)

thanks :)

I use Mobil 1 5w30 synthetic blend, but if you are really meticulous about your G then the best choice is Mobil 1 5w30 full synthetic.:D ;)

Castrol GTX 5w30 every 3k-4k miles with Nissan OEM Filter.

i heard that Mobil 1 is a bit too thin for the engine and full synthetic aint always the best route to go, semi is ok. Im running Castrol GTX Magnatex 10/40w

yeah that magnatec stuff looks good...halfords reccomended that to me from their list of cars with associated motor oil...so now i have a gallon of this stuff and an oil filter sittin in my garage...and no clue as to wether i should do the change myself or not...i dont wanna go half way and realise i cant do it or the filter wont come off, cos i know they can be a right bastiod to get off

PrimeraGT150 I think you name should technically be PrimeraGT148 LOL Primera GT P11 has 148 HP standard:bandit:

I've used both Mobil 1 & Mobil Super S (semi synth.) in both my old eGT & my current GT and found no noticable difference

Im happy with Castrol GTX Magnatex, it made a real difference from the running in oil i was using after i had the new pistons fitted. \the car pulled better, ran smoother and quieter. jus my 10 pence worth:D

Neil82, i've just got a Supersprint exhaust & a K&N K57i Kit,
which i've not installed yet, but when i've done it i'll hopefully
change my nick to PrimeraGT160 or so :D

BTW here is a homepage i made for my car, it's in Norwegian so you won't understand anything, but u can see some pics of my car ;)

http://home.tiscali.no/primeragt

P11GT , u're Primera is AWESOME !!!!
U deserve alle the superlatives
for the amount of time , money and energy u r putting in your
project :flash:
I'd love to upgrade my P11 with a turbo too :))

Yeah im about to replace the GT mid section and CAT in my car and also get a K and N induction kit so I may well have a SRi175 (ish):licker: :finger:

Remember my cars still on the standard mid section and cat and I only have a k and n panel filter (buying a k and n is it any good?) so I think i can realistically get my SR20DE upto 170 hp, will you get yours rolling roaded after your mods? Whats the most HP that some has had out of a SR20DE from EUROPE?

Oh and can anyone that claims to have 160+ hp can they post a dyno chart?

I'm using Royal Purple (5w30).

It's synthetic . . .

Site (http://www.royalpurple.com)