I have a friend that has a 98 and a half,3/4 with the auto transmission and has a oil pressure issue i think. When he starts it up after its sits for a period of time the oil pressure takes about 10 to 15 seconds to get up to running pressure. I have both a common rail and a 12v and niether one of them have this problem, so i have no idea. So any help will be appreciated, thanks.