ugh - you gotta be careful what fluids you put in these cars...you're not driving around an old Ford truck here...
First of all, I know the 951 needs oil with higher ZDDP levels - I use Brad Penn Racing Oil but others use Mobil 1 or other brands that have ZDDP additives or add them if their oil doesn't have them (or enough). I'm pretty sure the NA is the same requirements.
You don't mention where the oil is coming from other than the front passenger side - not enough detail...but I'm sure the crappy high mileage stuff didn't help it out any. I've read nothing but bad things from folks who used fluids other than those designed specifically for these engines. It's definitely not something you want to take risks with...especially when you're talking a few bucks at oil change time.
Found this btw...
Quote:
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At this time, late October 2006, it appears that our old staple, Castrol, has reduced the ZDDP in GTX to about half what it used to be. The safest bet right now seems to be either the use of Redline (synthetic) or Valvoline VR1. Today I purchased 7 quarts of Valvoline VR1 20W-50 at AutoZone for $2.79/quart.
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http://www.ttalk.info/Zddp.htm