100K 5.3 Service

[NAMASafetyDirector]

My 08 Silverado 4x4 is creeping up on the 100K mark. Just wondering what kinds of service items I should be looking at getting done to keep it running properly. Looking at getting a trans flush, gear case/diff oils, spark plugs, serp belt etc. Just wondering if there's a big one that Im overlooking. Thanks in advance.

[Jeremy airjer W]

There are two serpentine belts. The one for the A/C compressor usually is pretty cracked by the 100K mark. If the other belt is not cracked than I would not worry about it.

Many shops offer a 30K service which includes all fluid exchanges (4x4 service is typically extra), all the inspections, tire rotation and balance, Intake cleaning and fuel injection service, oil change, and alignment check. These can be a great value.

I would check into the brake fluid flush if you are not interested in a 30k type service. One of the most overlooked fluids that is typically in need of replacement.

Other than that just drive it until something shows up.

[NAMASafetyDirector]

Got it thanks!

[sunniewally]

whats the deal that some say not to change trans fluid if you don't do it on a regular basis like every 30,0000.

[Down2Earth]

Yeah you are overlooking the active fuel management oil consumption that is about ready to start happening for you if it already hasn't. Trade it off on something different is what I would do.

[NAMASafetyDirector]

I looked into trading it off a while back at about 85000 but the dealers I went to would only offer me about $12,500 on trade in so apparently they dont want them either!

[Capt. H (Ret.)]

I believe there is a maintenance schedule in the owners manual and I would take a look at it. At 100K everything covered by warranty is about to go south. Nothing is covered forever but as the owner you need to feel confident that you have done everything you can to protect your investment.

[crothmeier]

Not every pickup had the oil consumption issue. Mine did though! started at 96k. I went through all the fixes under warranty and now it seems to not use any.

[CaptainMusky]

I would have the rear end fluid changed. If you have the locking rear diff, make sure they put a good "GM equivalent" lube in there because the locker can tend to get funky with a few more miles on it and the additive in the "GM" stuff keeps this from happening.

Make sure you check front wheel bearings.

IMO dont "FLUSH" the tranny, drop the fluid, remove the pan and replace the filter.

Never been a fan of flushing them because it just pushes all the fluid back through the filter. The filter should really be replaced.

It will replace about half of the fluid which if you do it every 60K miles you are golden.

Transfercase lube change. It wouldnt be a bad idea to flush cooling system.

Dont touch plugs, etc unless you are having issues with misfiring, poor mileage, etc.

[low277]

+1 on the checking of the front wheel bearings, I just replaced mine along with the front brake pads at 115,000 miles.

[aczr2k]

I did my 100k service 40k ago on my 08, I did both belts, spark plugs, fluid change on both the front and rear diff, transfer case and just a fluid/filter change on the transmission. I am not a fan of transmission flushes. Now at 140K its time for front brakes and I need both front CV shafts.