WHEN I START THE VEHICLE AFTER IT HAS SET A WHILE THE VALVES MAKE A LOUD KNOCKING SOUND I HAD NEW VALVE LIFTERS INSTALLED AND IT STILL KNOCKS. ONE OF THEM COLLAPSED AND THE MECHANIC REPLACED IT BUT IT STILL DOES IT. WHEN I GET THE OIL CHANGED IT WILL QUIT FOR A FEW DAYS THAN START AGAIN. I USE 5W20 OIL IN IT AS IT CALLS FOR.
LIFTERS ARE KNOCKING on 2003 Mercury Mountaineer
Asked by for the 2003 Mercury Mountaineer
check the oil level if your missing oil fill to spec also get a lucas that always works good for me may work for you too.
THE OIL LEVELS ARE FINE IF I USE LUCAS OIL ADDITIVE SHOULD I USE SYNTHETIC SINCE IT USES 5W20 SYNTHETIC THE VEHICLE HAS A 104,000 MILES IS IT POSSIBLE THE LIFTERS ARE JUST BLEEDING OFF . IT HAS EXCELLENT OIL PRESSURE ON START UP AND WHILE DRIVING.