That depends on the coach . Mine charges $ 100 should be $ 175 but I ' m a student a month for four times a week training sessions at 2 hours each . I ' d consider this relatively cheap as ive heard that some coaches charge upwards of $ 200 a month . <| sep |> It depends on the vehicle . Most kick in at 610 psi . Older engines like my 302 with fewer parts needing pressurized oil can survive at idle with only a few psi , just enough to maintain oil flow , without damage , Ive had it happen . Now if you run a DOHC engine to the point where it only has a few psi of oil pressure , especially going down the highway , that fuckers toast . Ive seen that happen as well . Luckily if you check and change your oil regularly you have little to worry about , as oil pump failure isn ' t that common and failure that would cause low oil pressure to that extent isn ' t either .