Originally Posted by scorpion90

So I'm wondering if Red Line's Engine Oil Break In Additive would be a good addition to the oil since it states that "designed for flat-tappet camshaft engines and essential for solid-roller and hydraulic roller valve train".

It also states: "For use in conventional motor oils lacking zinc, phosphorous (ZDDP) and anti-wear additive packages necessary for protecting against excessive camshaft and valve train wear".

It seems a lot of observations on motor oil change are about valve noise. I wonder if this additive with be a good addition at regular oil change intervals. I plan on using a full synthetic (royal purple) so maybe it's not as necessary as with other types of oil?