I have 2, 2002 park ave's. one is ultra w/ superchrgd eng w/ 88k mi. other is base model and engine w/ 118k mi. each has very different OIL PSI levels as read from dash cluster gauges. ultra psi ranges from 59-71, base is 129 psi all the time. what should it be? should they be different given engine differences? of course, both are 3800 v-6 series II.