regular mobil 1 5w-30 is a TRUE synthetic, if you don't believe me check out their website, they break down every class of oil and advertised oil. I personally used it for 21k on my z and no problems. The only difference between Nissans oil and Mobil 1 is the fact that the nissan oil has ester in it. Also Redline is a Ester based oil. So IMHO i think some guys on here are getting confused with the fact that Ester makes the car run quieter than mobil one or any other non ester based oil. I run 5k on my oil because 99.5% of my driving is just highway miles and no stop and go traffic. The more stop and go traffic you have the more often you should change your oil. Buying any oil at walmart will save you atleast 5-10 bucks rather than buying it at a parts warehouse, but buy the filters from there. Mobil 1 has some good filters out there, or K&N :D thres my 2cents worth

Yes, according to US law, it is a "true synthetic". According to German and Japanese law, it is not.

If an oil is defined as Group III, it has a natural petroleum base. If it is Group IV, it is a complete synthetic from the ground up, not a synthetic "blend".

It's that easy.

it is a GF-5. here is the link my man, Mobil 1 5W-30 Advanced Full Synthetic Motor Oil

The only thing requiring it to be a GF-6 is the lack of ester.

also some more info on your arguement of it not being a FULL synthetic Mobil 1 5W-30

I'm about to give Royal Purple HPS a try, see how that performs

We are talking about two completely different things (global versus US ratings).

I appreciate the info- however, I'd really like to not see this turn into a Mobil1 bickering back and forth between you and I.

I'd you'd like, I'd be more than happy to discuss this in PMs.

that was some good infor that you stated as far as it being only U.S. I however did search up the japan website for it and interestingly enoug it isn't even classified in any gf class. The 0w-40 is what they use for the gtr and it didn't have the gf rating. I did read in the owners manual a gf-5 is acceptable but gf-6 is best recommended because of the ester based oil.

mobile 1

/thread

found out some good info for oil as far as classifications. Here is a link http://www.ilma.org/resources/ilsac_finalstd011404.pdf
Any oil that you buy in the states should have a ilsac certification.

anyone have any info on penzoil platinium in a VQ engine?

same rating as mobil 1, ilsac gf-5