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

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.

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Average mileage: 159,062 (20,956–292,000)
Engines affected: 2.3L 4 Cylinder, 2.4L 4 Cylinder, 3.0L V6
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004
112 people reported this problem
68 people shared problem details
2000 Honda Accord- 2.3L 4 Cylinder145,000
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 ? thanks Carlos
1999 Honda Accord- 3.0L V6140,000
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?
2001 Honda Accord- 2.3L 4 Cylinder65,000
Has not been fixed, cannot find where leak is. Oil all underside of engine. Leaks pretty bad.
1999 Honda Accord- 2.3L 4 Cylinder190,000
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.
1999 Honda Accord- 2.3L 4 Cylinder200,000
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.
2000 Honda Accord- 2.3L 4 Cylinder84,000
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?
2001 Honda Accord- 2.3L 4 Cylinder
oil pooring out as fast as i can put it in got it for wift for xmass im in dog house
2003 Honda Accord- 3.0L V664,000
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...
2002 Honda Accord- 2.3L 4 Cylinder21,000
oil started to leak into the coolant. The leakage is getting worse with time
2003 Honda Accord- 2.4L 4 Cylinder
My have engine oil leak
1999 Honda Accord- 2.3L 4 Cylinder135,000
Oil in coolant; head gasket is fine; will require new block.
1999 Honda Accord- 2.3L 4 Cylinder116,000
Told by dealer that engine has bad / porous casting that lets engine oil and coolant mix once the engine heats up. Repair costs ~4000
2002 Honda Accord- 2.3L 4 Cylinder146,786
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.
1998 Honda Accord- 2.3L 4 Cylinder198,000
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.
2002 Honda Accord- 2.3L 4 Cylinder
Engine started leaking oil at 93,000 miles and it has been a continuous problem to present with small increase over time to present
1999 Honda Accord- 2.3L 4 Cylinder276,000
I just purchased this vehicle for a gas saver. Checking fluids I noticed oil in the radiator. I've been reading that this is a common problem. I have not yet repaired and wonder how to repair without having the same problem with a new engine and all the expenses.
2001 Honda Accord- 2.3L 4 Cylinder
oil leaking into the coolant.
1999 Honda Accord- 2.3L 4 Cylinder
It over heated and warped the heads we got that fixed and not too long after it over heated again...so the mechanic tested the engine under pressure and everything and could not find anything that should be wrong with it but some how oil is still getting into the cooling system and now I'm stuck without a car
2000 Honda Accord- 2.3L 4 Cylinder140,000
Oil in radiator, mechanic said these engines are known for having pourus block issues. No fix other than block or engine replacement. I put block seal in it every couple of months after draining and flushing the system. I notice leaking start back a month after reaplieing block seal.
1998 Honda Accord- 3.0L V6147,000
Seems to burn oil at a serious rate at about a quart a week
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