Skip the auto shop - Our mechanics make house calls

Q: Oil loss, can't find a leak, smoke coming from tail pipe and checked coolant this morning was foamy and a different color.

asked by on

Ok I have a 1990 chevy silverado with a 5.7 in it I recently purchased. It cranks and runs but it's burning at least 3 quarts of oil every time it's driven. I don't have any external leaks at all. I'm not sure if it's the head gaskets. I recently started loosing coolant also but this morning it was foam in radiator and overflow. Also the radiator fluid a different color now?? So is it the intake manifold gasket and head gasket?? Would you recommend getting a whole new motor?

My car has 150000 miles.
My car has an automatic transmission.

A: Hello there, there are a few causes for thi...

Hello there, there are a few causes for this type of issue. The vehicle should not be driven or started until repairs have been performed. A fault is causing the engine oil and coolant to mix together. When this happens, the oil can't lubricate the engine properly and damage can ensure if the vehicle is driven. The coolant when mixed with oil becomes brownish and can become chunky, which stops flow and overheats the engine causing further damage. The two most common faults that cause oil and coolant mixture are the head gasket and the intake manifold. A qualified technician, such as one from YourMechanic, will be able to diagnose the oil leak and perform any repairs required.

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・Save up to 30%

Get a quote

What others are asking

Q: White smoke from tailpipe

Your engine is getting coolant into it and producing the white smoke out the tail pipe. The coolant could be getting into the motor from the intake, head gaskets, or head crack. The system would need to be checked to...

Q: My car won't start half the time but if u wait 45 mins it will?

Hi There, What you are describing is a common sign of a failing ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly The insulation develops small fractures that...

Q: Suspension and truck lift

I am answering this

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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...