[Healeys] Spark plug color - what do you think

Al Malin amalin at mac.com
Sun Apr 26 10:58:20 MDT 2015

Why would you use oil on the plug threads and not anti-seize?  Just asking, I’m not an expert..


> On Apr 26, 2015, at 12:19 PM, John Spaur <jmsdarch at sbcglobal.net> wrote:
> Hi Larry,
> This is a link to the color chart I used. I think my plug color is close to #14. http://hpibajass.com/spark-plug-color/
> The carbon marks could be left over from the oil I used on the threads when I installed the plugs. I am curious about that too. tuning the car it was on the rich side; that might account for the carbon marks too.
> I am using Chevron with Techron because it is close to my house. 92 octane (R+M)/2. It is California winter or summer blend depending on the time of the year.
> Cheers,
> John Spaur
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