Oil cap was leaking fixed leak still has shaky acceleration and loss of power
Your PCV (Positive Crankcase Ventilation) there is an oil trap and associated hoses on the front of the engine. It runs from under the spark plug wire cover down beneath the starter (the oil trap is located here). Typically, the system plugs up and dries out. You need to remove the trap and hoses and clean the holes out beneath the trap which drain into the oil pan. I used a small brush and a bent coat hanger. I also drained the oil (needed to be changed anyway) and sprayed some sea foam down there to loosen things up and then blew it out with rubber hose with compressed air. It worked well. Pay special attention to cleaning out the bottom hole because this is where it gets clogged the most. The parts cost about $150 or so.
SOURCE: leaking oil from oil cap
The problem is there is to much crank case pressure, make sure the PCV ( positive crankcase ventalation) valve is working correctly.
SOURCE: 740 Oil Cap Leaking, Lots of Oil
presuming the oil is coming from around the filler cap..theres usualy a rubber seal around the base, these can become brittle and break,sometimes quite a large piece (1/4 inch) can break off making a fair old leak from the oil splashing around from the cam, replace it with a NEW one, should cure problem
SOURCE: my 96 volvo 850s oil cap leaks oil,can i get a better oil cap than the original one?
There is a replaceable rubber seal in the oil cap. The dealer is supposed to replace it every oil change. The stock ones are around $0.40 and an almost lifetime one is available for $10 from IPD. Are you certain it is the Oil cap leaking from the seal or is the PCV system clogged?
http://www.ipdusa.com/products/5884/115315-ipd-hd-viton-oil-cap-seal
SOURCE: my 1994 volvo 850 is leaking oil from the filler cap...why?
Clogged up PCV System ---maybe
Too much crank case pressure
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