I've seen this brought up here and there but I'd like to bring up a new discussion on it. evolutionm.net swears by this oil as the only oil to use in the t-case and rear differential. I've actually had a t-case go bad (not uncommon at all, especially at higher power levels) on my old evo while using amsoil severe gear 75w90. I don't attribute it to the failure, just a note, however:
Is there something special about this fluid? I've never been able to find any specs on it, other than it is SAE90 & GL5. However, it seems all SAE90 fluids run in the 13-24 range at 100c, and 600-700 at 40c.
Obviously, there is more to it than just viscosities, but here are a few examples of 75w90:
amsoil severe gear 75w90: 16.8 @ 100c, 109 @ 40c
motul gear 300 LS 75w90: 16.4 @ 100c, 109.6 @ 40c
redline 75w90: 16.1 @ 100c, 112 @ 40c
75w110:
amsoil severe gear 75w110:
redline 75w110: 20.9 @ 100c, 131 @ 40c
motul 90PA (not sure if this is sae90, doesn't seem to match specs): 14.5 @ 100c, 140 @ 40c, rated for GL4 as well as GL5.
Is there any reason why a 75w90 or 75w110 wouldn't work in place of the Diaqueen? Some special additive that isn't disclosed? The hearsay on evom is there have been a lot of failures on non-diaqueen fluids, but I'm not sure why that would be the case.
Is there something special about this fluid? I've never been able to find any specs on it, other than it is SAE90 & GL5. However, it seems all SAE90 fluids run in the 13-24 range at 100c, and 600-700 at 40c.
Obviously, there is more to it than just viscosities, but here are a few examples of 75w90:
amsoil severe gear 75w90: 16.8 @ 100c, 109 @ 40c
motul gear 300 LS 75w90: 16.4 @ 100c, 109.6 @ 40c
redline 75w90: 16.1 @ 100c, 112 @ 40c
75w110:
amsoil severe gear 75w110:
redline 75w110: 20.9 @ 100c, 131 @ 40c
motul 90PA (not sure if this is sae90, doesn't seem to match specs): 14.5 @ 100c, 140 @ 40c, rated for GL4 as well as GL5.
Is there any reason why a 75w90 or 75w110 wouldn't work in place of the Diaqueen? Some special additive that isn't disclosed? The hearsay on evom is there have been a lot of failures on non-diaqueen fluids, but I'm not sure why that would be the case.