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Now my question is: should I replace the intake valves on this cylinder or just the exhaust valves? I'm thinking probably yes... but maybe no? I'm keeping the vehicle as an extra for hauling young adult kids belongings as they move to a fro going to school and temporary work. It's never going to...

Root cause found. The cam lobe failed. The valve was adjusted per Honda's spec but that adjustment was done on the other side of the lobe in the valve-closed position, and the cam is good in that position. In the open position the failed exhaust valve wasn't fully opening by a significant amount.

Thank you for the reference. I will keep it in mind.

Here they are. These plugs were in the engine for 96k km (60k miles). The plug from cylinder 6 has some accumulation that doesn't appear on 4 and 5 plugs. Also there is a short across the plug 6 gap, which I assume is debris from when the valve disintegrated.

Would people here replace all valves (intake and exhaust) on this cylinder or just the exhaust valve pair?

I'm am leaning toward such a conclusion myself - i.e., that is an isolated random failure related to degredation of the valve itself. But I lack the experience to be sure about that conclusion.

Unfortunatley I didn't record that information before disconnecting the battery. Rookie error. I can say that van had no drivability issues before the sudden cylinder six misfire.

Yes. Valves where adjusted at 236k km (147k km). All were slightly loose except cylinder 5 which was had slightly tight exhaust valves. The gap of exhaust valves in cylinder 6 presently are 0.011 in for the good valve and 0.013 for the chipped valve. Honda's exhaust valve specification is 0.011...

Here is a close up view of the affected cyclinder valves. You can see that the crud buildup is more significant on the failed exhaust valve.

Can anyone offer an opinion on the root cause of this exhaust valve failure. In particular, the white residue that accumulated on the failed valve. It is cylinder 6 of a Honda J35A7 engine in a 2010 Odyssey Ex-L. The engine has 256k km (160k mile). I've owned the vehicle since new. It has been...

I just noticed the analysis report says "0W20" in the top right corner. That's incorrect. Both oils were 5W20.

I think the Motomaster Formula 1 Synthetic is made by Shell. I read that based on others digging up the MSDS. I had myself convinced at one point that it was Shell Helix, but that's speculation based on incomplete facts. Check the Canadian Tire web site for reviews and questions also, there may...

Attached are oil analysis results for a 2006 Honda Civic LX with it's original R18A1 engine with about 260000 Km (163000 miles). There are two oil samples on this report. The first, earliest, sample is Motomaster Formula 1 Synthetic (available at Canadian Tire in Canada). The second sample is...