Just looking at my old spark plugs I took out the car (306 1.6 TU5JP) and have noticed there is a green tint on all of them (on the electrode/insulator bit)
Should I be worried by this? I've never seen green deposits like this before, and I've changed quite a few plugs.
Any help appreciated.
Ben
These days plug colour depends more on additive package in the fuel than running conditions. I use regular UL Shell mine have gone deep purple. The lambda sensor has too.
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