It's been quite a long time since I have been around the GTR forums. I still have and love my GTR but life has taken me in other directions that take ALL my time up for the past 2 years. But I remember all the GTRLife and GTRHeritage split fallout and thought to myself if I want good answers this is the place to come =).
Anyway I have had my 2009 GTR since well 2009 (original owner). I mostly tracked my GTR 2-4 times a year (only a day and maybe 30-50 laps a day). But I spent the first 3 years battling overheating issues (up in Denver altitude 5280 ft ASL). I finally got all the temps under control after 10 laps:
- 230F max on coolant
- 245F max on transmission
- 230F max on engine oil (with secondary oil cooler)
In all that time I was an early adopter of the willall (middle spec) transmission fluid and their diff fluid. I always had good results with it (did a couple of UOA) and the car drives fine. But now a days I don't get out to the track except maybe once a year and with my own imposed change interval (2 years) approaching I am wondering if I should stick with the Willall or is there something better now?
Talking with Eric @ Boulder Nissan he likes Dodson and from my limited (time) research here it seems that there are lots of good fluids and it's mostly a price point issue at this time.
From everything I have read the list I am considering is for transmission fluid:
- willall (middle weight - not light or victory spec - same as I have run now for 5 years) - expensive though @ $700+ / 10L
- jacks transmission fluid (from talking with them on the phone it sounds more like the OEM ATF style fluid) - cheap @ $380 / 10L
- Dodson - not sure on price but I believe this is the thicker oil based fluid (I know they have different grades like willall IIRC)
- Nismo 75W-140
- Willall 75W-140 (I know this was expensive around $100 / qt - needing 3 qts for front and rear - especially with the rear willall diff cooler)
The main reason I am trying to explore options is I honestly just don't track the car as much so do I really need the heavier weight fluids? And when I did I was only seeing about 245F max temps. On the other hand I am 5 years with the willall fluids and around 35k miles with no issues [knock on wood] so if it's not broken should I fix it? I don't really care about the price of the fluids much as I would rather buy a more durable fluid with a longer OCI to save time and money in the long run. But my only concern at this point is am I doing any undue damage only driving the car spiritidly on the street where my max trans temps are only in the 185-190F range (I run the Greddy DCT). I am wondering if it might not be better for the transmission to run a OEM ATF like fluid since I am mostly street use now?
Basically is there any harm or something much better to run than the willall stuff in this day and age?
I would love to get your feedback on this - thanks
Edited by davidm_sh, 04 November 2014 - 05:11 PM.