I have 30k on my 2k3. I'm due for a minor transmission service. Should I have them put in Mobil 1 ATF or should I have them just put in Nissan Tranny Fluid. The reason being is that's it's only a minor tranmission service and I'm don't think the drain "ALL" the fluid and drop the pan to clean it? So should I have them mix MOBIL ATF with old fluid in the tranny already

 

I just drained, flushed, and filled my ATF last week with Mobil 1 and I am telling you that there is a night and day difference. If you can afford it, I would definitely go with the Mobil 1 or Amsoil.

 

I've been doing the drain/refill 5qts for two services now. Once at 25k and again at 35k. I plan to do it again at 50k. So far, no problems mixing it with Nissan OEM. My mileage is 38k now.