when your driving do at least glace at your guages once and a while and take note of oil pressure, if it drops to 1.5 or none while driving i would suspect something is ammiss.. i know when i let off the go pedal and brake the oil pressure goes down to around 1.5 which is the pressure at idle, but if your going 65 mph and the guage reads 1.5 bar then youve got issues