royal purple question.
Sorry. Couldn't resist.
RP is manufactured from VLC (Very Light Crude), one step from being gasoline. It's viscosity is lighter, so a drop in oil pressure during normal running would sound about right. However, if your burning oil at idle, you have bigger problems than just an oil pump going out. Monitor your oil level for a week or so; check first thing in the morning, before startup. If there's a noticable dip in the level, then you're burning oil. Let us know.

