Yep, with my Mazda 3 it was a 8 Allen key for the fill and 24 mm for the drain on the transfer case. On the differential it was 23mm for the fill and 24mm for the drain... I'm assuming for the CX-30 it should be the same.I also used RP Max Gear 75w90 in the rear differential of my daughter's CX-30 and it seems to be working fine.
When I went to change the transfer case fluid in the front end it had a different fill plug than shown on a Youtube
video for the CX-5 (there was no YT on the CX-30 yet). The CX-5 had a big bolt type plug (24mm IIRC)...the CX-30 seems to have a smaller plug which uses a hex key to open. The problem I found is that the plug seems to be blocked from removal by te transaxle mount.
Did you have any issue with the corner of the Allen key bolt being blocked by what appears to be a mount?Yep, with my Mazda 3 it was a 8 Allen key for the fill and 24 mm for the drain on the transfer case. On the differential it was 23mm for the fill and 24mm for the drain... I'm assuming for the CX-30 it should be the same.
I had someone else do it at the time as I was really sick, but from what I've heard they or others didn't have any issues that I'm aware of.Did you have any issue with the corner of the Allen key bolt being blocked by what appears to be a mount?
Did you miss the part of the discussion where there are certain specs you have to hit? It needs to be GL4 and specifically for hypoid gears, which is a rare combo. If you use random 75w-90 that is only GL5 you can damage the softer metals used.I would probably use ST 75w90 synthetic from Walmart
Did you miss the part of the discussion where there are certain specs you have to hit? It needs to be GL4 and specifically for hypoid gears, which is a rare combo. If you use random 75w-90 that is only GL5 you can damage the softer metals used.
The original SG-1 is actually 75w-85, otherwise 75w-90 is indeed totally fine as a weight, but it does needs to be both GL4 AND specifically have the right additives for hypoid gears, not random manual transmission fluid. Sorry, not trying to be a smart-Alec, but that point seems to keep being missed.Yeah, I missed that. It wasn't in the OP or any post made by the OP, but I just saw yours now
However, the original recommendation of 80w90 GL5 can be replaced with 75w90 GL5 with no problem, and most people never change the gear oil in their diffs anyway, so they will arrive at the junkyard on the original 80w90 GL5 from the factory.
Since it's a Mazda, the car will rust out before the gear oil becomes a problem
Maybe Motul Gear 300 might be a good choice. It's primarily intended for Subaru manual transmissions that are combined with the front diff, so both GL4 and GL5 are needed