The Pennzoil Platinum is on sale there now as well (buy one get one half off) for 25.99. Could you buy two jugs and then also get the Pennzoil manufactures rebate? If so, that would bring price down to near 10.00 per jug.
Well of course you could and this would be a deal if you need oil in the very near future.
If not, just wait for some even more favorable combo of store deals and coupons before jumping on the MIR.