Gt-R oil vs Z oil
 

When purchasing my car my friend; who also owns a Z, told me to ask the dealership to put in the Gt-R oil instead of the z oil for the 15000 tune-up. I wasn't paying for the tune-up the previous owner was, so I told him I would pay the difference between the two oils. My car is now running the Gt-R. Ok, it's doesn't have any advantage for me and was a waste of money, but is it causing harm?

GTr runs Mobile 1 from my understanding.

It does but is it ok in the z?

I would bet $100 they didn't put "GT-R Oil" into your Z. The GT-R's use 0W-40 M1 that can be bought at any parts store and charged your more for it. It won't do anything to your Z, some people even run that weight.

I would suggest rather than paying more for something just because your friend suggests it you consult your owners manual/search here and make an informed decision for yourself

How much extra was this oil?

I don't know how much it cost cause I paid for a couple other things. Besides value for money which apparently doesn't make it worth it, is mobile 1 better for our z's. If price wasn't an issue what would you use?

Genrally, any synthetic oil is 'better' for your Z as long as it's API approved.

Ummm....the 'GT-R' oil/Mobile 1 is actually less than the Nissan Ester Oil that they recommend for the Z. Just make sure you have the correct grade and stick to one brand/type of oil. Most people here go with Redline, Amsoil, Mobile 1 or Nissan Ester Oil.

All oils have the api rating on them. There is a standard for all countries called ISLAC and the oil that Nissan uses for the Z is a ISLAC GF-6. The Mobil1 that we all get off of the shelves is ISLAC GF-5 because it does not contain ester. Ester is a additive to the oil that helps limit the audio noise that comes from the valves clattering. While not using an ester based oil does not damage you car it just gives off the sound of your valvetrain. From what I was told by the service manager who is very knowledgeable about the Nissan oil, he stated that the Nissan oil is infact purchased from Mobil1 but they add ester to it and also put their name on the white bottles. Hope this helps you out.

The GTR oil is Mobil 1 0W-40. It will not cause harm. It should be cheaper than Nissan Ester Oil (the recommended oil for the 370Z). It will not cause any problems. It will make valve noise slightly louder, which isn't an issue.

Which will prematurely wear out components in the valve train.

My God.... another oil thread.

which has not been proven

I know, it's the most commonly non-searched topic on this forum

I really haven't too many people, or anybody really using Valvoline synthetic oil. I have used the Valvoline blended oil in my G37 & my dad puts this oil in his Nissan Frontier & my moms Acura MDX & we have not had any problems with it. Seems that the Valvoline synthetic oil is not as popular as the one sin bold up-above.

Despite the MASSIVE amount of oil threads I have yet to read one "my engine lost compression or blew altogether because of my oil choice" thread. I have also failed to read a "my oil choice added 10hp and 100k miles to my engine life".

I think it is safe to say by now that any quality 5w30 oil is going to be just fine, although I am not the first and certainly will not be the last person to suggest this.

Great... Another "I know better than everyone else because the dealership told me so" guy... :shakes head:

The owners manual recommends ester oil over regular synthetic. Its oil, how do you think it helps quiet the valve-train, by putting ear-muffs on it? No, by doing a better job than conventional oil's.

You wont hurt your car by using regular synthetics but the higher tier formulas like Redline are what is recommended. Why would you use something else... To save $15.00. That's the same line of thinking on why I only use 87 or 89 octane when the manual says 91 or higher... Saving $2.85 a fill up to spend on that dollar menu. Buy a Prius if you want to play that game, if you buy a sports car then treat it as such!