Car Problem Reports

Honda Odyssey Porous Engine Block Casting May Cause Engine Oil Leaks

Honda Odyssey Problem
22 Reports
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Model Years Affected: 1999, 2000, 2001, 2002, 2003, 2004

Engine Affected: 3.5L V6

Average Mileage: 159,833 mi (100,000 mi - 223,000 mi)


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 1999-2003. Honda may offer assistance with repairs, determined on a case by case basis.


  • Visitor, , 3.5L V6, 223,000 mi

    Not fixed yet... Had routine maintenance (timing belt etc...)... Prior to maintenance, only a slight occassional drip from oil pan seal... After maintenance, now leaking 2-3 or more drops per day... Dealer said engine block was porus near Idler Pulley. Dealer wanted to charge another $700 to tear down and patch with no guarantee. Dealer's Service Mgr was also rude and not dedicated to any customer service. Additionally, called Honda America - they wouldn't give me the time of day due to age and mileage. Van in great shape until they "Fixed" it... In my opinion a dealer should've known about this problem and suspected/checked for it before doing a bunch of expensive repairs on an old van. I hold the Dealer and Honda responsible for this issue... Anyone with suggestions...

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  • Visitor, , 3.5L V6, 188,000 mi

    I can relate. Same problem. Oil leaking from engine block and have been told the only fix is to use jb weld. Dealership tried this already. Either they didn't seal it correctly or another leak started. Have had it looked at by other shops and still haven't gotten it repaired. Leaking enough that i have to add a quart of oil every two weeks and it occasionally smokes from dripping on exhaust. So frustrated.

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  • Visitor, , 3.5L V6, 175,000 mi

    I have a oddsy honda2003 van and i see a leak near the main seal what can i do

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  •  Rookie

    I noticed oil on the drive way, I checked the oil filter, no leak. I took i took the car in to get checked out andthey said their was oil comeing from the engine block and running out the bottom of the engin. what can be done tro fix this problem

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  • Visitor, , 3.5L V6, 185,000 mi

    My leak is just above the oil filter housing, at first was thought to be a bad o-ring on the filter, then suggested that the filter housing seal was causing the leak, I replaced that myself and it continues. Cleaned the engine off in that area and watched and sure enough, a small amount of oil seeps thru the block and drips on the floor each day. It's only about a drop a day, I can live with that. My experience with JB Weld on engine blocks is not real positive, I would think that down in this lower area where the block doesn't expand and contract as much as around exhaust manifolds would make it a more reliable fix, and maybe next opportunity I get, I might smear some on to see if it works. I can't complain about the car, rebuilt the trans at 150k for $1800, other than that, it starts and runs fine and will for many more years for me. I use synthetic oil, change once a year at 15k miles. Never add oil between changes.

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  • Visitor, , 3.5L V6, 160,000 mi

    if you check the oil dip stick dots and when check oil level between these 2 dots ...then I later see oil leak...I must reduce oil level to FIRST DOT then it would be ok

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  • Visitor, , 3.5L V6, 100,000 mi

    As described already by the masses.

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  • Visitor, , 3.5L V6, 149,000 mi

    Oil on garage floor. after looking at engine removed rear main seal cover and found oil leaking

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  • Visitor, , 3.5L V6, 190,000 mi

    Rear engine main seal leak

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  • Visitor, , 3.5L V6, 163,000 mi

    spent couple thousand of dollars try to fix this leak, returns after a few days from shop. Incompetent Honda dealer. I gave up and just put something under the car as to not soil the driveway. Car still runs good and check oil frequently. Oil has never been low.

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