OIL LIGHT ON AND OFF AFTER ENGINE WARM UP ENGINE KNOCKS AFTER WARM UP 20W50 OIL IN NOW OIL IS NOT LOW.B WHEN ENGINE IS FIRST STARTED RUNS LIKE A DREAM THEN STARTS MAKING NOISE AND OIL LIGHT COME ON AT IDLE THEN GOES OUT SOON AS I REV ENGINE PAST 1600 RPMS OR SO PLEASE HELP IM A CAR MECHANIC SO I UNDERSTAND TERMINOLGY

TRY USING A GOOD BRAND OF 20W50 OIL FOR HIGH MILEAGE ENGINES. IF IT ONLY TAPS WHEN WARM, THAT IS WHEN THE OIL HAS HEATED AND IS THINNER

check your oil level, color, and smell. My guess is that the low oil pressure light is on because of literal lack of oil to pressurize. Generally when you get that light and a knock it points to major engine repair or replacing the engine. Knocks due to oil pressure can indicate many things from a bad head gasket to a stretched rod or blown piston rings. Check your coolant reservoir for signs of oil entering the cooling system as it will float on top of the coolant. By the sound of it it needs major mechanical repairs

Sorry absolutely no idea with my head under the bonnet -hood- Now has the opil been changed regular like every 5/6000 miles if its gungy and old then chances are you have knocked a big end out or two ,best advice is to trade it in quick whilst it still runs

HI, The Oil Light comes on to show a low oil pressure not just that it is low on oil. If your not experience any unusual engine noise i would not suspect low oil pressure but more likely a bad oil pressure sending unit.

100 psi is to much and will blow the seals in the motor.You need to find out what the oil pressure is suppose to be and if it is to low then replace the oil pump.

WHEN COLD THEN GOES AWAY WHEN WARM. THATS NORMAL FORGED PISTONS SLOP WHEN COLD.I HAVE 01 SILVERADO WITH 390,000 RUNS GREAT 21MPG 40TO50 PSI OIL PRESSURE KNOCKS WHEN COLD THEN GOES AWAY. NOT A PROBLEM. IF IT DOSE IT WHEN WARM AND LOW OIL PRESSURE WORN BEARINGS NOT GOOD.

knocks when cold ( Start ), then sort of diminish or disappears when warming up ???

Knocking goes faster when accelerating when cold ???

If Yes, then Piston knocking on the wall of the cylinder . The sound disappears as the engine is getting warmer it dilates and the gap gets smaller.

If this just started,

1. Put quality oil & filter ( Mobile Full Synthetic Oil & Mobile Oil Filter or Purolator )

2. Do not put cleaning agents mixed with oil.

3. Personaly i've put "Restore" Engine Restorer & Lubricant in cars with more then 200 000 km and the results are amazing. But only "Restore". My Volvo is at close to 300 000 km, and it runs great. It's not a cleaning agent.

By experience if the knocking just started you can put an easy extra 100 000 km on the engine before a rebuilt. Quality Oil & let the engine warm up ( 3 mins ).

Increase the viscocity of your oil. If you're using 10W30, go to 10W40. If you're using 10W40 switch to 20W50. Don't use single weight oil.

sounds like an engine bearing has bit the dust,

Possible oil sending unit problem.