Unfortunately your experience with PUP dropping out of grade is the rule, not an exception. Hell, I have a sample with 1700 miles on it and it was already into the SAE 30 range. I’ve seen other tests that were even worse, but basically all of them show it losing a lot of viscosity. And it most certainly is an issue, especially in an application like this.I've been doing my own oil changes and have been using the factory recommended Shell oil. I send an oil analysis to Blackstone each time, mainly just to show I've done the oil changes if I ever had a warranty issue. I do the oil changes at 4k miles and both times the results have come back and say that the viscosity is slightly low. Blackstone says it's not a concern and it's not due to fuel contamination. I still don't like that the viscosity is low after only 4k miles though. I'm going to switch to Mobil 1 on the next oil change to see if that makes a difference.
We don’t see a lot of high mileage Hellcats; fair weather weekend cars mostly. Many TRXs are going to live much harder lives as daily drivers. Short trips, stop and go. Year round. Some towing. And of course a lot of abuse. High oil temps and heavy loads. The Pennzoil may get “exposed” way more in this application. And unfortunately I think some people will be in for a nasty surprise once these start accumulating 100+k miles. Good idea to be proactive and sample. The engine can tell ya what it wants.






