Engine Oil Discussion

RustyRatRod said
What synthetic would you recommend with enough ZDDP for a flat tappet?

Mobil1 FS 0W-40.

RustyRatRod said
I tell you what. I recently changed Vixen's oil over to Motorcraft synthetic blend 5w20 and I can actually FEEL a difference in power and how more quickly the engine revs. I wouldda never thought it, but I can. I also mixed in some Rislone ZDDP additive just to be safe. I'm sold on it now, though.

I believe that. My daily driver is my wife's old car, a '09 Pontiac Vibe. It calls for 0W-20, which I used when I got it for free. That source dried up when I retired, so I started using 5W-30 synthetic I have from an old stash . I swear that thicker oil slowed down that little POS. It went from peppy to doggy with that oil change. But free is free, right?