Mobile 1 ATF in a TKO 600?

[JCoop]

FYI, the Tremec installation guide recommends GM Synchromesh, which is available at the dealers for around $15/qt. (You'll need 3 qts.). It is manufactured under contract by Pennzoil, who markets it under their own brand as Pennzoil Synchromesh @ $7.30/qt. at Autozone.
It is also made by Texaco for GM but probably only available at their stations as I couldn't find it retailed anywhere.

[John Owen]

I spoke with Tremec about 6 months ago. I asked about the suitability of Mobil 1 ATF for their 600 transmissions - was told it had been tested and approved for use.