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- #21
Ok. I am opening up all of the diffs to check now to be sure. Thanks. Is it ok to just top up with a different cst oil? To mix with existing or I have to remove the one in there?Arrma hasn't filled diffs up properly for as long as I can remember. It could be Arrma just being cheap and saving money on diff fluid, or there not being enough time on the assembly line to let the diff fluid settle into the gears and then refill properly (fluid weight of 100k or more takes a long time to settle in a diff case). Whatever the reason, I always check the diffs when I get a new Arrma vehicle. I can honestly say that all but one diff on my three 6s vehicles was half full or less. The one diff that wasn't filled half full or less, a center diff, was 2/3 full.
As a side note: it's not only Arrma that has issues with diff fluid levels. My three Corally vehicles had diffs that weren't full, but they were close to 2/3 or 3/4 full from the factory.