A vacuum gauge is a simple tool that can help you diagnose the condition of your engine. We'll explain how to use one in your car. If your vehicle has a cam shaft, your motor oil must be formulated differently for maximum performance and protection under high pressure and heat. AMSOIL DOMINATOR® Synthetic Racing Oil provides boosted protection in these applications #TechTipTuesdsay #CamShaft #Dominator #RacingOil | AMSOIL INC.