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Originally Posted by Apex_BRZ
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Good for racing. Not so good for day to day life. Get the oil too cool and it won't protect properly. Get the oil too hot, it won't protect properly as well. If anything, you will want to have a thermostatic setup with the cooler.
Quote:
Originally Posted by Apex_BRZ
Unfortunately, I overlooked the diff/trans oil and DID NOT change it. I've been tracking on the stock fluid for the 5 track days I've done, plus street miles. I have nearly 30k on the car and I have rear differential whining now, and I can only assume that is the cause. If I can get away with running a more race spec oil and only changing it once a year...that would be fantastic. I read here that others were changing diff/trans fluid every 2-3 or 4-5 track days.
Your thoughts? I'll need to bring the car in for warranty work, I'm guessing. I doubt changing the oil at this point will stop it.
edit: There are warnings on that page about using it on the street. My car is still a daily driver at the moment, so I need to consider that.
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If you want the transmission and differential to last a long time with an aggressive schedule, change the fluids every 2-3 track days...4 at most. If you want to keep it within reasonable changes, keep in mind that heat is what causes a lot of the issues. Yes you can have a differential fluid that can last for a year, but remember you will always have some sort of particles/shavings that accumulates over time. The magnitude is extremely small, but you always want to make sure you clean that up from time to time. The common schedule for diff and transmission changes has been around 3-4 track days or about 10k miles. The interval may sound short, but changing fluid is much less expensive than changing mechanical components.
Once you change your fluid, the differential whine should decrease. We suggest running Gear 300 LS in the differential if you are tracking.