This is interesting to me. A lot of people with classic cars and older engines with flat tappet cams like to use HDEOs for their higher ZDDP content. I'd like to see a tear down of a SBC with a rather radical flat tappet cam after heavy use with this oil compared to the old formula to see if the ashless AW can truly substitute 30% of the ZDDP content with similar or better wear protection.
We do know what High Performance Lubricants said.
Their very robust add packs, which by the way start with Chevron components and include Chevron basestocks, produce superb results.
I will always be very concerned with emissions system integrity as well as wear, with mega miles accrued, similar to on the road truckers...that's the world I live in.
I like my zinc/phosphorus...no flat tappets here, just hydraulic tappets and precise, laser clad valves seats.
I specifically chose HPL HDMO SL over HPL SP RC.
If there is no wear, who cares about "ashless" ???