Did you get a recommendation from the trans manufacturer?
Try to find some Tremec fluid its been unobtainable ...Although I havent looked recently... Tremec told me to use Dexron III/Mercon in my TKX... Originally was told to use Syncromesh, but that was changed to DExron III/Mercon.....Tremec recommends their own line of fluid for their trans. Hard to get a non-Tremec fluid recommendation for the tkx.
I’ve actually never used Amsoil in any products I own. It’s hard to find where I live.
Royal Purple is NOT recommended in a TKX....Old tko/3550 pensoil or gm synchomesh. T5/tkx good old valvoline max life.
Only fluid that any manual transmission I owned hated was royal purple synchromax in a 3550. Killed the brass synchro with a simple maintenance fluid change, went from shifting fine to the synchros not slowing the gear down even just cruising that's back when they marketed it as compatible with gm synchromesh.
I wouldn't recommend it for anything but 20 years ago they recommended it for 3550... Mine hated it, put new syncho rings in a couple weeks later.Royal Purple is NOT recommended in a TKX....
Thats my plan, but at the 500 mile change I wanted to use a synthetic Dexron III/Mercon..Tkx I would just run basic dexIII for the break in atleast.
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