Q: There's no milky residue on my oil cap or my dipstick but there's oil in my radiator I know I have a bad spark plug wire.

asked by on

If I had a bad spark plug wire would that put oil in my radiator

My car has 203700 miles.
My car has a manual transmission.

Hi there. A bad spark plug wire would not allow engine oil into the cooling system. The possibility of a bad head gasket, could allow engine oil into the cooling system. Assuming the engine has not been overheated, electrolysis could have created a head gasket issue. Have not found any information indicating your engine was equipped with an oil cooler. The cooling system contamination should be properly diagnosed to avoid unnecessary repairs. I recommend having your vehicle’s bad spark plug wire and oil in the radiator be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. There's no milky residue on my oil cap or my dipstick but there's oil in my radiator I know I have a bad spark plug wire.

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: Shifter doesn't move like it should.

Hello and thanks for the question. The fact that you can shift it out of park tells us that the interlock is working. You could have a faulty cable which is either broke or sticking, and your shifter itself could...

Q: will not keep a charge

The battery and charging system will need to be tested to see if the battery can be charged and handles a load test. If battery fails test then it should be replaced first. After the battery is tested and replaced,...

Q: it over heat and now wont start and the engine oil looks like milkshake

Milky or milkshake-looking engine oil indicates the engine oil and engine coolant have mixed together. This can happen after a severe overheating of the engine. This mixing can happen from either the head gasket cracking, or the cylinder head itself...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...