It looks like there's always going to be a small amount (an ounce or two) of residual of dirty gear oil left, since the drain plug is side-mounted. I'm getting ready to do my own fluids, including diffs, and have a few questions. No reason to if you are happy other than conservation of money and time, but you should be okay unless, as above, your fluid is coming out like in the thread above.Ĭhoester, thanks for taking the time for the writeup. I would say that you can probably extend your front diff drain interval. That fluid is super cheap, and can be purchased at Advance Auto easily. I have, and stand by the fact, I have used Mobil-1 75W-140 in the front diff, albeit with some limited slip additive - but that is probably unnecessary in the front diff. What it takes to make a quart of synthetic gear oil in 2014 is a whole lot of energy and additives, and I say why waste what you paid for. So, it isn't such a big deal for you to change it - but it still can be pretty wasteful. The Nismo Motul is quite expensive, as well as the OEM Castrol. Since you are using Motul (regular I presume), the price argument is basically non-sensical. But, it appears that manufacturers account for it when they are planning "break in wear" and manufacture the diffs accordingly. So I go with longer intervals on that, do it the same time as the tranny. My first change on the rear diff, the fluid was cleaner and less residue on the plug than on the front diff. I don't have any reason to believe you're wrong, my first fluid change just made a strong impression on me. Since I'm usually changing the engine oil at the same time I do the front diff too, since it's less than a quart. Maybe because Motul, maybe because more frequent changes, maybe both. Subsequent fluid changes the fluid is much cleaner. I have been running Motul ever since mostly because I find the Castrol harder to get ahold of. My first front diff fluid change the fluid was super dirty and lots of residue on the magnetic plug. On the other hand, if your fluid is coming out looking like the fluid in THIS particular write up every 6-8 trackdays, I will suggest that it is being burned/overheated and should be replaced on your interval. Icarus, we can certainly debate this, and there are caveats to each and every different GT-R. Nothing harmful in doing it as far as I can tell, but fairly wasteful with the cost of the OEM fluid.Īdditionally, cheaper fluids can be used in the FRONT diff with little to no adverse effects. Replace rear under tray.Įdited by choerizo, 23 January 2020 - 11:57 PM.īased on fluid analysis that I have produced, this is WAYYYY aggressive. The drain plug has a magnet as well and will be dirty (be sure to clean well). Remove bottom drain plug and catch the fluid. The top fill plug has my socket inserted and the bottom drain plug is ready to be opened. It may be helpful to support with something to prevent it from falling down. Remove rear tray (the CF one under the transmission). Use your favorite hand pump to get it back in. I measured 0.65L again rather than let it drip out over the fill plug since my garage has a slight incline. I put a funnel to catch the fluid and drain into our make shift measuring cup.Įnded up draining just a little bit higher than 0.65L:Ĭlean the drain plug well. Start by removing the fill plug first, then the drain plug. You have just enough clearance to get your 10mm hex socket in there with some extensions.
Note the two plugs that take the 10mm hex, one on top (fill) and one on bottom (drain). A quick makeshift measuring system for input and output fluids:Īfter removing the front undertray, you should be exposed to this (where you normally would change your oil). Rear diff: 25 ft/lb fill plug, 39.5 ft/lb drain plug, 1.35L fluid **note this changed from earlier years to later to avoid seal issues from too much pressureīefore I started, I wanted to pre-measure the amount of fluid I was going to need and I wanted to see how much would drain out.Front diff: torque 26 ft/lb fill/drain plugs, 0.65L fluid.2-3L of your favorite diff fluid (I used Nismo Motul 75w140).Breaker bar or something to break loose the plugs (they are on pretty tight).Just hit 18,000 miles and took the day to flush both diffs.
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