[packrat5]

Discussing oil is an argument that no one ever wins. Diesel oil is formulated for diesel engines only. Mostly zddp has been removed from diesel oil as well. zddp was removed from STP oil additive. Now it has been reinstalled, and both versions are available. I personally use Mobil 1 in everything I own. The High Mileage stuff (blue label) has a little zddp in it. Nothing I own has roller lifters, and my oil choice seems okay. I think this whole zddp thing is blown way out of proportion, kind of like the unleaded gas thing that was going to put all old cars out of commission. Whatever, we all have opinions.
Why are you so worried about oil pressure? Is the engine that bad? I always thought that you would see a red light flash on in your dash before you would notice a low gauge reading. Either way, when the light goes on, or the gauge gets noticed, it's way too late, the damage is already done, the indicator is merely informing you of it, don't blame either one.