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Car Gurus: Oil Question

MikeyIs4Dcats

MikeyIs4Dcats

Lifer
My fiancee's car oil light came on, so i was looking at it last night. The oil had a weird appearance....it was not evenly coating the dipstick, but was on it in puddles and streaks. I seem to remember that this was a sign of something....anyone know?
 
yeah, im gonna say something is getting mixed with the oil, whether it be water just randomly, or coolant. Does it have any different smell? Drain the oil and check it to be sure.
 
It's a Hyundai (yeah yeah yeah). The oil is very dark, as she's about 500 miles past due, and had a slightly burnt smell. The dipstick also had some light brown stains on it. There was no milky appearance or rainbow hue to the oil.

She's going to get an oil change tomorrow, but was curious if there was something else wrong....oil lights don't come on just because you need an oil change.
 
Sounds like coolant in the oil...

Depending on the year/model of the car you could be looking at a head gasket.
 
sounds like the oil is just completely broken down. where is your geographical location? been a hot summer?
 
Originally posted by: MikeyIs4Dcats
It's a Hyundai (yeah yeah yeah). The oil is very dark, as she's about 500 miles past due, and had a slightly burnt smell. The dipstick also had some light brown stains on it. There was no milky appearance or rainbow hue to the oil.

She's going to get an oil change tomorrow, but was curious if there was something else wrong....oil lights don't come on just because you need an oil change.
Click to expand...
500 past what? If 3000, it might not need to be changed anyway. The 3K oil change interval (myth) is slowly going away.

Dark oil doesn't always mean something bad. Just that it's doing it's job. Some oil is dark out of the container.

Take a pic of the dipstick and post it here.
 
If the oil light is still on I would not drive it. Oil light is for oil pressure. If it is on it means you are VERY low on oil or there is oil but no pressure.

Driving with oil light on = bye bye car.

The only other thing it may be is a bad sending unit. i.e. your car is fine but the oil switch is not working correct.
 
Originally posted by: AdamSnow
Sounds like coolant in the oil...

Depending on the year/model of the car you could be looking at a head gasket.
Click to expand...

Agreed. And for the bashers this can and does happen to a vast amount of car makes, not just Hyundai.
 
It sounds like coolant in the oil to me. Have you noticed any coolant usage?
The head gasket seperates three areas: oil passages, coolant passages and cylinders. If you have a break in the gasket between the oil and coolant, the car will run ok but you will get oil in the coolant and coolant in the oil. If the head gasket causes a leak between the cylinder and the coolant passages, you will get coolant disappearing but only when the engine is cold. The pressure from the cylinder will force air/gas into the cooling system when hot, and when it cools it will suck coolant back into the cylinder.

When the oil doesn't cover the dipstick evenly, you have water/coolant mixed with the oil.
 
don't recall any smoke, but I'll check tonight. I did notice a small amount of oil around the corner of the cylinder head, so that probably points to a lown gasket too. The light comes on for a second or so, then goes away. The oil level appearred to be fine.
 
If you can't get a proper reading, the car might be really low on oil. If that's the case, the remaining oil could be getting burned up.

If it's got some kind of a rainbow effect, that sounds like contamination of some sort. If it's milky, that could be coolant in your oil. That's usually caused by a cracked block or a blown head gasket.

It could also have gas in it from a faulty fuel system. The fuel overflows and gets past the pistons. That's no good because when the oil is diluted with gasoline, you're not getting any kind of lubrication.

If the oil light is on though, I would not drive the car, especially after what you're describing with the oil. I would have it towed to the shop. It could be the difference between replacing something minor to replacing the entire engine.
 
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