Took my 91 Grand Wagoneer to Jiffy Lube last week for an overdue oil change. (note it is getting colder here in New England) I noticed that every morning since when I start the car the oil pressure guage is pegged at the top ("80"), after 15 to 30 minutes the guage shows a more 'normal' pressure range, anyone have any idea of what is going on? Did Jiffy Lube put the wrong viscosity oil in the ole' girl?
tnx