As far i know the coolant is consistent. i put a mark on the resevoir today so i can be sure. haven't checked compression or pcv or anyhitng like that. an oil change has no affect on the pressure. I have been hearing valve ticking under light-moderate acceleration. My Dad sugested throwing in 15w50 oil in with some lucas to bring up the pressure, so i'm going to try that out. I am also going to take the oil pressure sending unit off and hook up a gauge to check the pressure, to make sure the sending unit is not faulty. since i purchased this car about 8 months 7k miles ago(stored 4 months for winter), i don't beleive the oil pressure has even been over 45psi at all.
i haven't noticed any metal shavings in my oil or any odd smells, it looks / smells like normal used oil.