One thing is for sure, the 0w40 is like a different oil. Just doesn't look near as impressive as even this PU 0w40. The calcium bugs me, I wonder if they had a bad batch? Which in itself would be a bad sign. Looky here Syn, voa 5w30 PUP, I just don't get it. Yours are way off from others, Lower calcium without the magnesium to back it up would likely be the culprit for the tbn being low. That uoa blows me away, I don't know what to make of it. We need to see some more in the penzoil thread for comparison. 1800 calcium with magnesium not bad, when you don't have mag you need like 2300 plus calcium for a longer oci.