New oils with less ZDDP.
If I remember correctly, we were playing around with the ZDDP at work, and without it the dang oil turned solid. I mean SOLID. It was hell trying to clean that mess up, and eventually I would have to just chuck the whole block.
Hehehe we were also running the oil at over 300deg f and with the engine running quite a while over 4000 rpm. It would always shut down on low oil pressure, and smell horrible.
We were working on a fuel additive that would work it's way into the crankcase.
Man I miss my job