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Old 04-17-2007, 06:43 PM
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Question oil in coolant resevoir

Hi- I have a 1999 accord w/ 74,000 miles. The car runs great, but I have noticed what I think is oil in my coolant resevoir. Operating temp is always normal, but I do have to add oil to the engine somtimes. Should I worry about this?
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Old 04-17-2007, 07:49 PM
PennHonda PennHonda is offline
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oil in the coolant reservoir could mean that your head gasket is leaking.

I would change the oil to see if there is coolant in it.
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Old 04-17-2007, 09:10 PM
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Quote:
Originally Posted by PennHonda
oil in the coolant reservoir could mean that your head gasket is leaking.
not always true.
what about the oil cooler?
it is just as common of a problem i think.
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Old 04-17-2007, 09:29 PM
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There is no oil cooler in Accords...usually it is the head gasket
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Old 04-19-2007, 05:54 PM
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Smile

Thanks for the info everyone, I appreciate it.
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Old 04-19-2007, 06:07 PM
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Yes, I'd worry.

I'd not suspect a bad headgasket on the f23 in a gen 6.

The gen 6's 4 cylinder it seems are prone to cracking the block in the oil gallery that is on the rear of the motor. The crack is not repairable and the only options are replacing the short block or another engine.

I've not run into one personally, but read on iATN of at least 2 dozen with cracked blocks. This always seems to happen on cars with low mileage, 70 to 120k or so.

If you only have a slight amount of oil, soon it will be tons. They don't usually allow coolant to leak back into the oil as the engine oil pressure is so much higher when running.

Double check the trans fluid if it's an auto. If there were atf in the coolant it would appear frothy pink, and the trans fluid on the stick would appear that way as well. (from the cooler in the rad)
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Old 04-23-2007, 04:30 PM
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I changed the oil myself and there was not any coolant in the oil. Then I checked the ATF and that was good. I'm going to keep checking the coolant resevoir and see what happens. Thanks for all the input.
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Old 05-12-2007, 09:24 AM
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re: oil in coolant '99 74,000 mi

Just found out the dealer thinks "most likely" that I need a new head gasket. They also want to take the block out to test for cracks about $200. I also need timing belt and water pump. Then coolant flush 129.95 and engine flush for 149.95. A right outer cv boot. Total labor $1564.99, I will get the parts on my own from work at cost since I work for American Honda at a parts center. I also went through honda customer relations and they will not cover any of the bill. I also showed the dealer my reciepts for repairs and maint. which he shared with the honda rep. but that didn't help. I'm just really ticked off at this situation.
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Old 05-12-2007, 09:36 AM
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Here is some good advice that I got from another forum "Always diagnose before throwing money at a problem"

I would be careful when the shop says "thinks it may be a head gasket". A leakdown test would verity that the cylinders are holding pressure and can pinpoint a leak in your engine.

For a $1500 investment, you want to be sure that you are fixing a real problem.

Also, I would not pay for a coolant flush or engine flush. The coolant flush is a pretty simple DIY job. Drain coolant, add water + radiator flush, run engine, drain, fill with water, run engine, drain, fill with 50:50 coolant:water.

For the engine flush, I would just change the oil at the proper intervals, since you didn't see any coolant in there.
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Old 05-12-2007, 04:48 PM
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PennHonda -- said it all really always make sure you know what's wrong before spending any money on repairs, and when you spend money on diagnostic tests, always start with the cheap easy tests first..
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Old 05-13-2007, 09:33 AM
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Have you owned the car since new? Has it overheated at any point? The number one reason for oil & coolant mixing IS the head gasket. Depending on where it's flawed you get oil in coolant or coolant in oil. THAT'S not a flaw with the car usually....it's had a problem in the past that has become bigger.

If it were mine, I'd have it diagnosed by testing the oil system with pressure via the VTEC selenoid. It can have the cooling system pressurized & see if the oil gets coolant in it, but since at this time it's going the other way it may not show up.

USUALLY when a block is cracked the oil goes outside.....but then again it depends on the crack.

Over 90% of the time what you're describing is the head gasket.
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Old 05-13-2007, 04:51 PM
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Thanks for the replies, I bought the 99 accord new, it has never overheated. Even before I took it to the dealer the temp gauge always read normal.
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