^^
I've also heard that running thicker oil in street engines isn't good from several other people that study oil and know their stuff. Just because it shows good oil pressure, doesn't mean it's getting to where it's needed, it's kinda like yeah, you have 60 psi at idle, but is it really doing good where it needs to be. Am I right?
10w30 here, and it's not done me wrong in any motor I've ever had. Again, it goes back to preventative maintenance.
To touch on the penzoil thing, Read and seen several cases where penzoil sludges...especially up in the top of the engine, around the valve springs and such. Of course, if you have someone that's religious about it, you'll never convince them it's not a good oil. Again though, just from my perspective...never ran the stuff before.
