04 mercury mountaineer v8 low oil pressure reads out at idle sometimes.
my daughters car is either a 2002 or a 2004 mercury mountaineer. it has the v8 and it has 209,000 miles on it and sometimes when slowing to idle the low oil pressue reads out on dash and the gauge drops to 0 and goes right back up sometimes on its own or just by tapping gas. it runs very strong and smooth at around 40psi all the time and will go immediatly back up to 40 and does not jump around.could this be just a sending unit sensor or do you think it is a faulty oil pump. where is the unit located and the previous owner used synthetic oil for some time and do you recommend this in a high milage vehicle? any info is very helpful