Hi again,

I have a question on what I need done on the 100,000 mile service aside from regular items like tires, battery.

According to the Manual, it looks as though I need:

1. new air filter (I have replaced it at least 2 times already but due for a new one)
2. Oil change
3. Spark plugs

Do I really NOT need to:
1. change the transmission fluid? According to the footnote, the only thing that may apply would be the warmer temperature outside, but where I live it only reaches 90 degrees outside for maybe 5 - 6 weeks a year, but not all at the same time.

What else is recommended for keeping the HHR in tip top shape?

Thank you!

 

Well, I look at it this way, servicing a 4T-45E transmission at 100,000 miles is a ton cheaper than replacing it later on down the road.

But if you're mileage is mostly highway use in moderate temps, then you could go by GM's sealed for life assumption and just keep motoring along.

The worst thing to do would be to ring up 300,000 or 400,000 miles and then service the transmission, that's a guaranteed way to end up installing a replacement in short order. Because the new fluid would carry away all the particles of clutch friction material that were allowing the transmission to function.

One other thing to consider depending on your oil change intervals, driving style, and the sound of the engine(any rattle from the timing chain?), would be a timng chain tensioner replacement as outlined in this excellent :How To: thread below....

https://www.chevyhhr.net/forums/how-...-rattle-46159/

 

Change out the cabin air filter!

 

If you haven't changed out the coolant, you are overdue on a 2008. 5 years or 150k miles:which ever occurs first: is the lifespan.
Now would be a good time to replace that Dexcool if it's needed. Wouldn't hurt to put in a new thermostat also.