: Spark Plugs

06-07-12, 10:47 AM
When should the Spark Plugs be changed on my 2006 STS V...it has 109000 miles on it. What other maintence is needed at the 100000 mile mark?

06-07-12, 11:26 AM
If they're original at 109k change them..your owners manual should list other recommended 100k service items.

06-07-12, 08:07 PM
engine air cleaner
trans fluid & filter
throttle body service
spark plugs
engine cooling (5 year or 150Kmiles)

06-08-12, 09:01 PM
Use OEM plugs.

STS Serge 172
08-07-12, 03:31 PM
Sorry to bump an old thread, However; I have a question--What's the difference between "1st" and "2nd" design spark plugs?


Thanks for your time to who ever answers!

STS Serge 172
08-24-12, 03:25 PM
So GMPartsDirect.com replied to my emails and gave me 2 different part numbers:

12597464 SPARK PLUG (USED ON VEH W/41-990 12597464 SPK PLUGS)
12565996 SPARK PLUG (USED ON VEH W/41-988 12565996 SPK PLUGS)

...now whats the difference between em? which ones are better? They are very unclear and I'm hoping someone here can point me in the right direction. I need em ASAP as I have already exceeded the 100K mark.