Not getting oil to the pistons. Making knocking noise. Wont stay on.

knocking noises that get louder and in time with a compression indicates a failing big end or main bearing
for a quick check remove the HT leads one at a time and if the noise goes or reduces then it is a bearing for that piston

have the timing checked if its off it could be pre-ignition which some people describe as a knock. if its a heavy knocking noise it could be a piston noise or it may even be a bad crankshaft/connecting rod/bearing. have the oil pressure checked this may help to know what to do. some people describe a rocker noise as a knock but its more like a ticking noise at the top end in the area of the valve covers.

Very possible.
You may have damaged a rod bearing or piston pin from lack of oil.

if it gets louder and faster as the engine speed increases then a piston is knocking...if it is just at idle like you said then it could be a bad oil pump if oil light is on at idle or it could be the connecting rod knocking on the crankshaft because it is loose.

Hi!!

This noise can mean bad news, but, let's not panic and try something.

Some times when oil level gets too low, the lifters discharge and valves start making a quick knocking noise that doesn't quit even if the oil level is normal.
and increases when you step on the gas.

This happened to my friend's car and fix the problem adding a Valve Quiet oil additive, in a couple of minutes the noise was gone.

If this is not the noise you are hearing, take it to a mechanic shop for repair, preferably on a Tow Truck, because the more you run the engine, the more damage you can cause to it.

Good Luck

sound like an internal engine problem. either one or more of the pistons has "piston slap" and that knocking will diminish as the engine warms up or possibly a rod bearing is worn out. have a tech do a manual oil pressure test to make sure the oil pump and main bearings are ok. piston slap or knock that decreases when the engine warms up is not that serious, but a rod bearing knock or possible oil pump failure should be taken care of asap.

You might have a blown head gasket. The milky oil is an indication of water getting into it, which would point toward your head gasket. You should have a compression test done.

No, there is no direct oil feed to the gudgeon pin. There is a cross drilling on the upper half of the bigend of the conrod that allows oil to be sprayed upwards at the right moment to both lubricate and cool the piston. It sounds more like you have piston slap (excessive piston to bore clearance) that will be more pronounced when the engine is cold. It's always a good idea to either let your engine warm up a little before driving, or just drive sedately until it has warmed up.
It could be small end related, but that noise is generally only noticable at that point where the load is least on the piston to conrod connection - ie: at the time where the piston pushing the conrod changes to the conrod pushing the piston, and vice-versa. Don't worry about an oil flush. Sometimes it's the carbon deposits that stop an engine making MORE rattles!

This is a very common issue with General Motors. I have never bothered to try and fix it because it is not causing any harm. It is because General Motors still uses a push rod motor and the cold oil causes it to knock a little until the oil gets warmed up.