Thanks for the comeback, DCF.

I will certainly follow your advice to use OEM plugs. In the past, I had 'misfiring' episodes occasionally and this could be one of the reason.

Just wandering if you categorize 'misfiring' as/or similar to 'premature detonation'? MB says that this is one major cause of head gasket-related problems. The other is engine overheating. I use 'high test' gas exclusively on my vehicles, never regular grade to prevent engine knock.

Thanks again for your kind assistance.

__________________
Josemin


88 MB 300E
88 MB 560SEL
99 MB ML 430