SOPUS rebates have been all over the map for at least the last dozen years. You could almost always get one on some basis.
Last year, SOPUS offered MIRs on Quaker State and Pennzoil oils for the entire year.
This time up, there is an MIR on Pennz syn oils only and only through 6/30.
If I were going to guess, I'd imagine that QSUD is next up for the MIR, starting maybe 7/1 and there might well be another Pennzoil rebate later in the year. I'd be a little surprised if there weren't.