Originally Posted By: Pete591
http://www.driveaccord.net/forums/showthread.php?p=757135
I own an Accord V-6 EX-L. about 15,000 miles. Both the 7th and 8th generation VCM engines have loose fitting rings and and the plugs overheat to the point of needing to be replaced every 12,000 miles even with IRIDIUM NGK's. This is especially true for cylinder # 3 which is off a lot in the ECO mode. The spark plug in cylinder 3 will actually burn off the insulator and it then falls into the cylinder.
Honda has changed heads and engines. Reprogrammed ECM's and no real fix or understanding of the problem. The cars usually burn about 1/2 qt per 2,000 miles and this makes engine service lights come on and many catalytic converters aregetting plugs up from carbon issues.
A massive recall is being looked at as cases are coming towards a verdict. Honda has really messed up and it's unusual for them to do so this badly.
So in the interim here is what has been done in my case:
Told to use combustion cleaner at every oil change.
GRP. III synthetic oil still allows blow by and oil loss. A GRP IV like Royal Purple 5W-20 cuts this down by 2/3. In Europe Honda is using 5W-30 and 0W40 and this issue is not being seen like it is here to lightweight oils.
I am going to use Redline 5W-30 as it is an Ester Grp. V. and retains a 40wt oil charactoristics at even very hot engine temps. and the Honeywell Filtech 15400-PLM-A01 is the only oil filter to go with and document changes or if you have an engine failure they will blame it on your oil filter to be sure.
HOnda says not to extend drains. I have due to this matter chosen to change every 5,000 miles and plugs every year. With combustion cleaner (Sea-Foam at oil change). Additionally, a slower burning feul such as 89 or 91 octane is prudent. Honda says use "at-lest 87 octane". It's a very high compression engine.
Unfortunately with this VCM engine it's pay now or pay later.
Sad but true.
Which is why I got the 190 hp four cylinder!! I have heard too many horror stories about the V6. That and you can not get a manual with the V6 in the sedan. I have heard of nothing bad about the K24Z3 in the EX sedans.