Royal purple
 

Is royal purple max ATF comparable with xjs? Its going to mix with the kind I have in now until I can change the fluid enough to cycle out the old

What transmission do you have?

Quoted from their website:
"Max ATF is NOT recommended for the following applications: Allison TES-389, DEXRON® VI, Ford Type F and MERCON® SP & LV, Honda DW-1, Hyundai SP-IV and NWS-9638, Kia SP-IV, JWS 3324, MAN 339 Z3, Mercedes Benz 236.8, 236.12, 236.14 & 236.15, Mitsubishi SP-IV and ATF J2, Nissan Matic-S, Saab 93-165-147, Shell M-1375.4 (ZF 6-Speed AT), Toyota WS (JWS 3324) and ZF TE-ML 14C. Max ATF is not recommended for use in any CVT or DCT applications."

Yes that will work fine. It's compatible with both Dexron II and Dexron III applications which cover early and later AW4s