Oil leak passenger side 300 turbo sedan, some on front passenger side wheel. Never lost oil pressure, but dipstick showed very little oil in crankcase on immediate after-run check. Have not started engine since, to be cautious. What could it be?

2004 3.5L v6 oil pressure switch is under the passenger side of the engine behind the oil filter.

Easiest to get to from under the engine. To find it, take off the right front wheel, then the front plastic access cover that is part of the inner fender, behind the right front wheel. You will see the oil ??? filter. The switch is behind the oil filter.

2 questions.
1) Is the oil actually low on the dipstick?
If it is, you might have an oil leak, so you would need to look underneath and see. Also look for puddles when you park.
The most common reason for such consumption would be a burst oil pressure switch, or a leaking valve cover gasket.
Either of these will leak lots of oil.
The last possible reasons, which are really rare, would be engine parts defective,( like oil rings), or a leak in the brake booster which would suck oil from the crankcase into the brake booster.
2) If the oil is not leaking out, and the dipstick shows full, you will be needing a new oil pressure switch, or to have the electronics repaired.
God bless your efforts.

A plugged pcv system will cause excessive oil leaks. But it sounds like you have a massive leak. If the passenger side is leaking behind the timing cover there may be up to four seals that may leak.single cam motor will have one cam seal dual will have two cam seals. Crank seal and possible oil pump seal. Would recommend pressure washing motor, go to local parts store and get some engine dye. Then support car and let engine get warm. And try to pinpoint leak.

The dipstick tube should go back in right above the oil pan flange.If its a front wheel drive it will be in the front of the motor a little left of center in the block above oil pan flange.Trucks are in the same place but vary on which side its located on.

OK, anytime oil gets into the cooling system or vice versa, there's a strong possibility that there is a leak at the head gasket.

Could have to do with overspeeding the engine.

The cooling system can get up to 14 to 16 psi, enough to burst into the oil lines which run next to the cooling lines in the head and block.

If it's spilling on the front driver's side of the car, then you have some serious problems with this engine.

There are (2) three and a half inch long jack pads on both sides of your vehicle along the frame rail located exactly twelve inches behind each of your front wheel assemblies. You can place your jack stands safely there. Your oil filter is located on the passenger side of the vehicle, so you'll need to remove the oil filter by accessing it right above the lower control arm using a three-pronged oil filter wrench and a 9" extension with a ratchet.

IMPORTANT! : Always replace the oil drain plug gasket with each lube, oil and filter service. (it looks like a copper or aluminum washer)

P.S. - Don't forget to adjust your tire pressures to 30 p.s.i. in accordance with the tire placard located in the driver side doorjamb.

Fill radiator & pressure test the system. You will need a rad pressure tester for this operation. Also check the oil & oil dipstick for white residue in the oil . Antifreese may be leaking into the oil. Do the tail pipe finger test to see if there is a fowl burnt antifreese smell. This could spell a head gasket problem. Also check for signs of wetness on the passenger side floor mat. This would indicate a heater core leak. Check all hoses & connectios fof leaks. Good luck!

if it's a diesiel the it's coming from your oil line to your turbo. if it is gas then it could be a leak coming from a leaking valve cover gasket.

the pcv valve gets plugged up those building up pressure in the crank case and blowing out the oil pump seal on the front of the motor!

The oil switch is located on the passenger side of the truck in the back of the engine. Look for the transmission dipstick, then feel for it between the transmission dipstick and the engine block. It is hidden pretty well, but a socket wrench will fit to take it off. The new part uses a 1-1/16 socket, the old part for some reason was smaller, I think 13/16 inch. Hope that helps.