5W-40 engine oil okay for 6G74?

[Mohit]

A couple of weeks ago the oil was changed in my engine at it's service (5W-40 full synth due to Sprintex blower).

My car is now being converted back to N/A due to the sale and i'm wondering whether i should change the oil back to what i was using pre-blower (10W-50 semi synth), or keep using the 5W-40 that's in there now?

On another note, the spark plugs will be changed over as well. Will be using NGK PFR6J-11 Platinums so my 2000km old NGK BKR7EIX Iridiums are up for grabs for the boosted crowd.

[Mr_Roberto]

might wanna change the oil to 10W-40

[Disciple]

Depends how it gets driven and your climate. Personally, I'd probably run 10W-50 if it gets driven in a lot of city traffic or gets driven hard. Otherwise, 10W-40 is fine.

[VRX]

5W-40 should be fine. The 5W refers to the viscosity of the oil when cold. 5W or 10W when cold is ok.

[Blue Lightning]

Please correct me (i'm sure a number will) but wasn't the "factory fill" 5w30? so 5w40 should be fine. It comes done to the "quality" of oil you pay for, if it is quality and costs a "little" more the $20 for 5 litres then you'll get what you pay for.

[JarRah]

I mostly used 10-40. Car does 'alot' of urban driving and often meets 5500rpm and so far no worries except for the lifters in the morning making the car rough as a lady of the night from port kembla but once the engine reaches normal running temp everything is peachy.

[Mohit]

Just an update on this. Madmagna drained the 5W-40 oil that was in there and refilled with 10W-50 oil a few weeks go. Straight away the engine was quieter and smoother.

So 5W-40 obviously a must when going with a Sprintex blower but if N/A 10W-50 works the best, at least in my case.

[SupremeMoFo]

I'd love to know what was in my car when I got it, it was slow to rev and not very smooth, a fresh sump of Magnetec (10W40) and it was smoother and revved out smoothly (still lost power at 5500rpm though of course)

[Supra_t]

I'd love to know what was in my car when I got it, it was slow to rev and not very smooth, a fresh sump of Magnetec (10W40) and it was smoother and revved out smoothly (still lost power at 5500rpm though of course)

I think the bloke took a piss in my old 1J when i bought the soarer, it was going through about a litre every 2-300kms thought i had some problems. After i changed to Mobil 1 it didn't use a drop untill the next change.

[burfadel]

Nulon ESL (Engine Stop Leak) works suprisingly well if she's using oil or blowing smoke. A Ford Laser of someone I know was blowing smoke (the blue oil kind), particularly at takeoff, and it didn't matter what oil they used. After running that through it after a few hundred km no more smoke & no more oil burning! I reckon with the oil capacity of the magna you'd need two bottles though

Its not an oil thickner, its one of those that supposedly reconditions and softens seals, seems to work a treat. She didn't use it on the next oil change (with the same oil) and it still was fine, but since its fairly inexpensive a bottle of that goes in (as well as worn engine treatment).