2000 honda accord oil in coolant10/19/2023 ![]() In most vehicles, the cylinder head sits above the cylinders, forming a roof over the combustion chamber. However, when the cooler fails, motor oil can get into the cooling system. The purpose of the system is to cool down the oil to an acceptable level. Advanced systems are often found in high-performance or race cars. The oil/coolant heat exchanger is vital to keeping the temperature of the engine down. When neglected, it can lead to serious engine damage. If you don’t repair the head gasket immediately, the engine is going to start overheating. You may see brown sludge sitting in the coolant reservoir when this occurs. Yet, when it fails, oil is going to leak into the cooling system or vice versa. It keeps the oil from mixing with the coolant. The head gasket is located between the engine block and cylinder head. Let’s examine these options a little closer. There could be an engine block crack, a faulty transmission fluid cooler/heat exchanger or possibly oil got into the system by accident. It could also be a bad oil/coolant heat exchanger or a crack in the cylinder head. If you see oil in the coolant reservoir, there could be a blown head gasket. Then I checked the bottle of fresh clean oil, and it fluoresces green too! Weird! So, that's pleasantly meaningless.Conclusion Causes of Oil In Coolant Reservoir I checked the oil fill hole with the blacklight again, and was dismayed to see that the oil definitely had a greenish fluorescent tinge. Still no smoke in the exhaust or chocolate milk in the engine, at least. The coolant tank has been overfull since they replaced the radiator last year, though, and I may have overfilled it previously, too, since the tank is almost impossible to see through. I know from previous head gasket experience that the coolant tank overflowing can be a bad sign. It definitely looks like oil now, though.īut when I stuck a straw down there the other day, it came back with an inch of black goop covering it, and I see black spill marks on and around the recovery tank, so I think it overflowed the cap and pushed the layer of oil out: I checked the coolant again today, added a little water so it came up to the top, and it doesn't look so bad, just a few drops: My friend drove the car for ~400 miles and nothing major happened. Last oil change and inspection was 4 months ago. Under a blacklight, the little oil puddles in the oil fill hole might be fluorescing green? Or it could be my imagination, it's really hard to tell. How do I judge the urgency of this? Is it ok for my friend to drive it 200 miles? :/ĭrove it around for a few miles, temperature was perfect, no smoke in exhaust, no milkiness in dipstick or oil fill hole. I think that part of the coolant tank has been dark for a long time, but it's hard to remember. I don't know if this is fresh oil or it's been in the tank for years. ![]() I don't think the coolant level has changed since then. Radiator was replaced over a year ago because the fan thermostat was broken and it was overheating when I stopped moving, and bursted the radiator plastic. I did recently get a pending check engine code P1? for the coolant temperature not being high enough? But most of the time I'm driving it's in exactly the middle where it's supposed to be, never goes over. ![]() The oil level is normal and doesn't seem frothy. A little deeper is clean coolant, and the coolant in the top of the radiator is clean. I was going to loan my car to a friend tomorrow, and checked the oil and tire pressure etc earlier this week, but couldn't see the coolant level, so I just went to double-check it with a drinking straw, and pulled out black goop floating on the coolant. ![]()
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