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Message: <blockquote data-quote="Shadowrider" data-source="post: 3324826" data-attributes="member: 3099">[USER=15054]@swampratt[/USER] it's the oils we have today. The EPA has mandated that the ZDDP (EP additive) all but be taken out of our oils because it causes catalytic converter failure over time and likely won't make the .gov mandated 5 or 10 year emission system warranty. There is barely any of it in there in motor oils today. That additive is what made flat tappets last to begin with and one reason the automakers were basically forced to go to roller cams across the board.If you are running old school hydraulic or solid lifters you need an API SG or maybe SF (I forget) rated oil or earlier. And be sure to find out the PPM on the ZDDP too as that's just where the ZDDP level was mandated to be cut back to basically nothing, so there might still not be a lot in there. But it's one of the cheapest and most effective EP additives, so if you can find oil to that old of a spec there's a good chance it'll be in there. If I ever get an old classic I'll be running Amsoil Z Rod oil in it. It's made specifically for that application.If you think that is BS, just wait....The automakers are having to spec 0W16 weight oils due to fuel economy CAFE mandates and even lighter oils than that are coming! <img src="/images/smilies/pissed.gif"  class="smilie" loading="lazy" alt=":pissed:" title="Pissed    :pissed:" data-shortname=":pissed:" /></blockquote>