Skip the auto shop - Our mechanics make house calls

Q: I have oil smoking out of my oil dip stick and oil filler on my valve cover. Lots of smoke coming out of my PCV valve

asked by on

I have a lot of smoke coming out of my oil dipstick, my oil cap, and when I remove the pcv valve while the car is running, a lot of smoke comes out. The pcv valve still has lots of suction and I just replaced the valve cover gasket so I don't think it would be those. The car still runs fine but it's a bit more shakey when stoped at a red light or anytime the car is stopped while in park or reverse. Any other advice on what it could be?

My car has 50000 miles.
My car has an automatic transmission.

A: Hey there. Worn piston rings create more cr...

Hey there. Worn piston rings create more crankcase fumes (i.e. the smoke you see coming out of breather tubes and orifices). This is called "blow-by". As long as the PCV valve stays clear, and the engine can handle the fume/clean air & fuel mix, then you should be fine.

This is a normal stage of wear as long as tailpipe blue smoke doesn’t become excessive or offensive. The rough running at a stop light may be an early indication of too much blow-by, although those 6 cylinders engines had trouble with rough idle/low speed because of the big differences in the distance between the carb and each cylinder (Cyl 1 & 6 distant, cyl 3 & 4 very close). Keep it tuned, and watch for slow degradation in low-speed running. If you notice this problem worsen or would like to have this checked, then have a qualified professional from YourMechanic come to your car’s location to inspect the smoking problem and follow through with repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Transmission swap and what is my transmission?

Your vehicle could of been equipped with a C3 or C5 transmission. A 1971 F100 came with a C4 or C6 transmissions. Since your car did not come with the any of the same engines or transmissions the F100 came...

Q: 4x4 mustang

Anything can be done legally with the proper precautions. As you may already know, this will be a costly conversion that you will need to have inspected by the state of New York authority that governs highway safety and transportation...

Q: Burning a lot of oil and none is leaking out, how bad is it?

Well, you may be one of the lucky Honda Odyssey owners that was included in the Class action lawsuit in the court of Northern California, Alex Soto and Vince Eagan v. American Honda Motor Co., Inc. settlement on September 9,...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.