ZDDP and Valve Train Question

Hi everyone. Newbie here.
I got a 2007 Tacoma with the 2.7L, 2TRFE engine and was curious if I should use a shot of STP on oil changes for the extra ZDDP content.
It seems they've lowered that anti-wear additive content in motor oil recently and some people have had problems with cam and lifter wear (except those with roller lifters).

My question is really what rides the cam lobes on this engine?
In the parts blow-up, it looks like a roller on the rocker rides the cam lobes to reduce wear, but short of pulling the valve cover, it's hard to tell.
Toyota Help doesn't know. The dealer doesn't know. No one seems to know how this was built.

Thanks!
Rob

 

I don't know anything about the chemical formulations of lubricants but I can welcome you to Tacoma World!

 

Welcome to TW, There have been huge discussions on this forum, and I assume others about oils, dinosaur V.S synthetic, additives V.S straight. I agree with Phantom about the I-4 engine, it very well might be the best out there. I have spoke to many people, with all types of engines and mileage, I can't determine any one thing that helps the life of the engine save one : REGULARLY SCHEDULED MAINTENANCE !!! You keep up with that and don't beat it up, and you should have many happy miles !

 

You don't need all these additives to the oil. Just keep your truck regularly maintained and your truck should last quite some time.

 

Thanks for the replies, guys.
In a sense, I do trust the engine...what I don't necessarily trust are the new motor oils.
These engines out there that have a few hundred thou miles on them started out with API SL rated oils with the higher ZDDP anti-wear content. Now they are being fed (as of fairly recently) API SM rated oils.
That was my point of concern. But I suppose it'll be alright.
This forum rocks!
Thanks again,
Rob

 

OK. FYI: I found it on a Press release page. It apparently does have roller rockers that ride the cam lobes. Good engineering move.

Rob