Hi,

I'm contemplating to change the ATF on my 20 000km P11 Primera Auto to synethic.

I had read nearly every post on ATF here.

Please correct me if I'm wrong :-

API GL-4 is mainly for manual trans. It is a mineral oil.

For automatic, the manual requires Dexron® III or IIE specification. I believe the stock comes with mineral Dexron® III compliant oil.


Mobil 1 ATF is a synthetic oil and is Dexron® III compliant, however, it did not specify the specs on copper strip corrosion unlike Pennzoil which has a spec on this.

I'm suspecting that all Dexron® III oil will cause copper corrosion which is a problem with SR20. Any expert advice on this ?

Now, should I or should I not use Mobil 1, that is the question !

Ok guys additional info.

Do not use a GL 5 rated fluid in your AX 15. I spoke to a tech at Valvoline , he said the 3- 4- 5 ratings are the additives in each fluid and the GL 5 additives will eat at your brass syncro's. This you already know !

......but...synchronizers are only present in manual transmissions. Please correct me if I'm wrong.

Mobil Syn ATF are API-GL-5. This I had found out and it should do auto transmission fine.

Any expert views please.