Positive Crankcase Ventilation—three dirty words, but do they really need to be perceived that way? In general, the PCV system has two main functions: vapor relief and liquid separation. PCV systems ...

No matter how tightly within the prescribed specifications an engine's piston clearance and ring tension are in its cylinders, a certain amount of fuel and combustion vapor slips past and enters the ...

Internal combustion engine blowby, whether gasoline or diesel, occurs when part of the compressed mixture of air and fuel leaks past the piston rings during the compression or power strokes of a ...

Although some maintenance schedules include an interval for replacing the positive crankcase ventilation, or PCV, valve, others may not. In the latter case, a general recommendation is to replace the ...

Crankcase ventilation is almost provided in all automotive engines. Its prime job is to prevent the dilution of lubricating oil present in crankcase which may lead to corrosion of crankcase metals if ...

My 1995 Volvo 850 non-turbo (with 160,000 miles) has an oil leak at the rear main seal or RMS, probably because of crankcase pressure. When I remove the dipstick and stick a balloon over the top and ...

I have a 2015 Nissan Frontier. It only has 57,000 miles and does not leak or burn oil, to my knowledge. I take it to a reputable national oil-change place every 3,000 miles for oil and filter. I have ...

Question: I'm working on my Ford E-150 van with a 4.2-liter. Can you tell me the location of the PCV valve for this engine? I took the air housing covers and the engine cover off looking for it, but ...

Q: I have a 2015 Nissan Frontier. It has only 57,000 miles and does not leak or burn oil, to my knowledge. I take it to a reputable national oil-change place every 3,000 miles for oil and filter. I've ...