Honda Accord Problems

Engine Oil Leaks Due to Porous Engine Block Casting on Honda Accord

Problem Description and Possible Solution

The engine may develop and oil leak due to a porous engine block casting. The repair procedure is dependent on where the leak is located. Honda has released a service bulletin covering model years 1998-2003. Honda may offer assistance with repairs, determined on a case by case basis.

(173 people reported this problem)

Honda Accord Vehicles With This Problem

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Average mileage: 159,503 (176–292,000)
Engines affected: 2.3L 4 Cylinder, 2.4L 4 Cylinder, 3.0L V6
8 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004, 2009
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Viewing 1-20 of 71 comments
I have had this Honda Accord now for a year and a half, with no problems, never overheated, excellent mileage etc. and 3 weeks ago I discovered a substance resembling molasses in the coolant expansion reservoir, then I opened the radiator cap and discovered more of that substance in the radiator, checked the engine oil level and it dropped closer to the lower dot. I always ensure that the oil level is between the 2 dots

The engine oil is super clean no trace of any coolant, so I am assuming there is a crack in the engine. I constantly monitor the engine oil level and top it off as needed ( approx 1 quart per 1000 kilometers), and I also empty out the expansion bottle into a waste oil container once a week and fill it with fresh coolant .
The upper radiator hose was also replaced because it started to deteriorate.

I am not sure what to do to fix the problem, other than replace the engine, what other solution is there ?

I was told by the Honda dealer that my Honda has a porous block and the only way to fix it is to replace the engine with a used engine because they can not get a new engine. How do I know the used engine will not have a porous block?
Has not been fixed, cannot find where leak is. Oil all underside of engine. Leaks pretty bad.
Oil is leaking from bottom ... Not sure where leak is coming from .. It has always used oil but not very bad then suddenly started leaking a lot when car is running .. Don't leak if car is off
My '98 accord leaks oil out as fast as you put it in. My mechanic says it's not worth fixing. I'm wondering if pourous block is to blame. Oil in coolant reservior. New head gasket.
Replaced head gasket. Still find oil in radiator. Must be a leak in the block. I wish Honda would admit the problem so there could be a diagnostic. A lot of people have wasted a lot of repair money on a design flaw that has no fix.
We just got this car and now, we have oil in the cooling system. I was told I have a "porous" engine block and need to replace the engine. Also, the check engine light is on and I was told that I may need to replace the computer.
I was told "this is a problem car".
This is all adding up to close to $4,000!
I am wondering should I keep this car or trade it for something without so many problems?
I just recent noticed oil leak on my Honda 2003 Accord Ex V6. I was told by Honda service team that they were not 100% sure until they have to remove the transmission to determine the cause for sure.

With 64K miles and good maintenance record from Honda service. I was told that could be cause by engine block which may cause 5-6k to replace the engine.

I am kind disappointed with the news, but that was my bad luck then...
Engine started leaking oil at 93,000 miles and it has been a continuous problem to present with small increase over time to present
oil started to leak into the coolant. The leakage is getting worse with time
Have had to replace head along with heater core and have to flush out oil in cooling system. Quite frustrating. I certainly would not re-sale this car for more than 500 to 1000 dollars. Bought it for around 4000 a few years ago. I don't think as highly of Honda as I used to. Will just have to keep flushing it out until we find another vehicle that is dependable.
The leak started around 140000 miles. I took the car to the Honda dealer and they replaced a seal, removed the oil filter and bracket and replace something in there. Got the car back and it still leaked. The Honda dealer said it had a porous block. I asked them to refund my money from the first oil leak and they said it did not have anything to do with the porous block and they would warranty the work on the first leak they repaired. It is still leaking from around the same location as the first time they repair it. I told them it is a factory defect if the block had thin spots in it and they told me it was not. They also told me to repair it I would have to buy another block and have them put it in.
engine seems to be leaking oil. oil light comes one every 3 days and add a quart of oil. The other day after adding oil engine became extremely loud. using the proper 5w-30 oil.
Oil leakage getting progressively worse. Have had all gaskets and valves replaced. The oil light goes off for about a week and then comes back on. Going thru about 2 was of oil every 3-4 days.
Found oil in the coolant system. So I drain all the oil leave the drain plug off put 15 psi air pressure leave it over night found 1 litre next morning Found block has little crack.
Told by dealer that engine has bad / porous casting that lets engine oil and coolant mix once the engine heats up. Repair costs ~4000
Oil in my water resivor it is a 98 Honda Civic LX with a 1.6 liter. Had problem when got it has 2k on engine you think it is a head gasket problem?
Oil in coolant reservoir and radiator. Dealer says car needs replacement motor. Sold car for parts.