I�m at almost 100k miles in the Silverado. I changed the plugs today.

How do these look to y�all? Seems like you can tell which ones got deactivated with the AFM system.

AFM? Anti-Ford Motor?
Always Fishing on Monday?
A Fine Motorboat? (not talking about one on water)

Half look s rad rich. But all in all pretty good for that many miles.

Active Fuel Management. I�m not a fan.

I put a can of sea foam through the throttle body before I changed them. Fogged it out pretty good. Put about 6 Oz in the crankcase oil and the rest in the gas tank. Took about a 20 mile drive and getting 3-4mpg better already. I was averaging 14 hey and 11 in town. Back to 17-18 hwy after the new plugs. Going to let it work through the engine oil for a few days then change the oil.

About what you'd expect from a healthy engine nowdays.
In the old days of leaded gas and $1.25 each plugs, you'd need to change them almost every year.
Modern generation fuels burn cleaner with very minimal deposits, and modern plug electrodes don't burn up as fast.

Motorboating for the win

Kinda funny I changed my plugs in my Chevy today also. All mine look pretty close to yours. I couldn�t tell ya the last time I�ve done it.

Am I seeing 2 different types of plugs??

The 1st set shows DCP3 and the other shows GCP2.

Wow! Didn�t notice that! Wonder what that�s all about? They came from the factory that way

All in the first pic are from Driver�s side. Second pic is from passenger side.

They�re facing opposite directions, so they may have the other number stamped on the opposite side.