If your lifters are ticking, you are creating wear downstream. I would try a RP filter and Redline any weight even 5w20 and give it 500 miles. Nothing has been proven better although there are some other alternative oil formulations with promise. Lifter tick is resistance, that lifter is forced up at a speed that isn't smooth. Cam lob hits the roller, roller moves the lifter quickly, lifter doesn't want to move. Where do you think the wear is being created? It's always downstream, it could be on other places as well, but pressure is increased at bottom point.
Now, some guys have lifter tick forever and have no issues, others have it one day and the cam fails, yes that has happened here. I think in some situations the roller is able to buffer or absorb the impact just a little enough to keep some hemi's working flawlessly. That is why they have a roller there in the first place. But I wouldn't go betting on that, I have also seen (heard) rollers smashed on the board, which ends in catastrophic failure as well. Many cam lifter problems on the board, I don't recall any cam lifter problems on the ford board I was on for a decade. It just seams to be a weakness on hemi's, and by the most part the board has seamed to solve it. It isn't 100% but close, and what do you have to loose the price of an oil change? If you are intent on keeping that m1 I would look at dropping a zinc additive just in case it might help. You should look at the cost of a wiped out cam and lifters before you choose to keep that oil, guys on the board have been paying over 7 grand for that by the dealer.
I wish I would have kept the thread, there was a guy on the board who had lifter tick and did 3 uoa's, his wear numbers where the worse as I ever seen. Maybe try and find that with search.
