Wore-out Old Spark Plugs

[Oberon67]

"How many miles are on these plugs?"

I don't really know, and have no way to find out. These plugs were what was in the truck when I bought it a few months and 2000 miles ago.

The truck uses a little oil, to the tune of maybe a quart a month. I check it when I get gas. I'm not certain how much is being burned and how much is leaking; I know a little bit is leaking because you can see a little seepage at the oil pan gasket.

I'm not using fuel additives. I am burning 87-octane regular gas with ethanol.