brown stuff on coil pack

[2footpegs]

hi, i changed my spark plugs to day and noticed a light brown paste/gunk on the end of the coils packs looked like wood filler. does anyone know what this could be. thanks

 

[LEE69]

Grease?

Maybe they were tight to go on?

 

[swilky23]

Maybe a drop of oil I had this on mine only on one cylinder though