Does anyone know what the hydrocarbon content is likely to be when a plug lead is removed?
Answers:
Your question is UNCLEAR. Carbon buildup is not a legit issue. Newer "hydrocarbon" cleaning programs are more aimed at the car owner, than the car. Some claims of lower gas milage and higher horsepower, are, just that- claims.
Buildup of carbon on pistons, rings, and walls is normal- Oil is designed to flow over those surfaces and protect. Change your oil @ 3000 on a 4 cyl ----4000 miles on 6cyl----- and 5000 on a v-8
yep i do
Hydrocarbon content of what?
Under what operating condidtions?
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