Rick is correct in his answer but the suspected spots are the oil cooler hoses from the radiator back to the oil filter adapter the pressure switch on the adapter and since you say both sides it should be the oil cooler lines good luck and powder up the lines and fittings and have someone else start the engine while your looking for the leak
Just a thought, can't you use a die in the oil, then use a black lite or something to spot the leak.
You might check crankcase pressure and pcv. If too much pressure, it will force oil out somewhere.
Spray down the engine with engine cleaner to get it clean. Then sprinkle baby powder on it. You'll see the wet spots right away once it starts leaking
SOURCE: engine runs rough at certain speeds 3.0 v6 flex-fuel 1999 ranger
Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..
SOURCE: Low coolant and oil smells like gas. No white/blue
let your car idle go back to the tail pipe if it seems to be steaming alot , and or smells like antifreeze then you have a head gasket problem or a gasket leak alowing in directly into your engine
SOURCE: oil leak on top front of 2002 f350 super duty diesel engine
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.
SOURCE: has a bad oil leak coming from under the car . The
The oil pressure sending unit screws into the engine block so you will need to look between the oil pan and the head.I suggest that you try tightening your oil filter first.
SOURCE: 4.0L ford ranger runs rough misses under load,
On the lean area look for a vacuum leak anything there,like PCV hoses and pull the plug on the EGR is there a difference?Is the valve hot at idle? Now check the rich side pull the hose off the fuel pressure regulator is gas leaking out? MAF cant do this, IAC cant do this ,TPS, If everything checks out no vauum no EGR leak No fuel regulator leak you may have to find out if the 02 sensor is reading the correct bank .Bank one could be on bank two, and bank two can be one bank one,It could be mismatched
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