Hi Arcturus,
Couple of questions first, what octane /lead booster are you using, and which brand and number type plugs? That's a weird colour probably attributed to your additive.
Assume it's a B18/20 A or B engine?
Only plugs I would ever use are Bosch (Volvo original fitment) or NGK, the latter BP5HS summer and BP6HS winter, or harder driving.
Most additives available especially from service stations are not great TBH.
J.
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