Oil pressure concerns

nm9stheham said

The need for ZDDP varies with pressure lifter-to-lobe; this has been discussed in the research articles. Low pressure stock springs and mild ramp rate stock cams seem to mostly survive OK with the lower levels of ZDDP in the 800-900 ppm range that the newer oils have.

But you can't extend this situation to all engines and certainly not to any high performance cam and lifters.

Click to expand...

Agreed, with all except the content of ZDDP in modern oils. The new GF-6 spec mandates phosphorus between 600 and 800 ppm. This is the same as the recently current GF-5. Analysis has shown many current oils to be at the lower end of this range. Still probably fine without high psi valve springs. Also, modern oils have introduced other anti-wear additives such as molybdenum and boron. Sides are split as to how well they work in high perf cam and lifter applications. Good old ZDDP is still the go-to in those instances.