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2021Trailblazer RS AWD Scarlet Red Metallic
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Discussion Starter #1 (Edited)
I decided to do my first oil change today on my RS with the 1.3T engine which now has 3500 miles.

The 1.3T engine calls for 4.8 quarts of 0W/20 Dexos synthetic oil and a GM/AC Delco PF66 oil filter. If you have the 1.2T engine the oil is 5W/30 and also requires a different filter. I bought Royal Purple oil since it's higher quality than most oils, but I would also recommend Mobil 1 which is factory fill on most GM's.
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I removed the whole plastic splash shield to get some pictures, but there is an access door that's easier to remove for oil changes.

If you remove the whole shield it's (13) 7mm screws and (3) plastic reusable rivets that hold the shield in place. The smaller access panel is just (3) 7mm screws.

The drain plug is a twist lock/unlock design with a large o-ring so it doesn't require a torque spec. The plug requires an 8mm allen wrench and is located on the plastic oil pan.
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The first recommended oil change is at 7500 miles, but after only 3600 miles the oil was very dark which I figured it would be for break in oil, so don't wait 7500 miles, lol.

I also clean the MAF sensor when doing an oil change. If you decide to do this you'll need to remove (2) T20 torx screws and use CRC MAF cleaner.

One word of caution! When filling with new oil, the fill hole has a small drain into the engine so pour the oil in slowly or it will overflow and spill out.

Here are some random pics I took while I was underneath.

Cool Watts Link rear end location system which keeps the rear axle centered properly.
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Exhaust system.
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One thing I found interesting was that the electric parking brake locks the front wheels and not the rear wheels like most vehicles.

Steve
 

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2021 LT AWD
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Great pics. I am waiting for my filter to arrive and going to do mine. Surprised that local auto parts stores do not carry an AC Delco PF66 filter.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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Discussion Starter #5 (Edited)
GM dealerships on eBay and Rock Auto both have the PF66 filters for cheap. I bought 4 from Rock Auto for like $4 ea.

Here's a pic of the black oil at only 3,600 miles. I seriously don't think waiting till 7500 miles is a good idea.
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Steve
 

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2021 TB Zues Bronze Activ
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Yea mine is at about 3100 now. I was going to change mine early. I can't do it myself (future lifetime warranty reasons) so will go to the dealer.
 

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2021 LT AWD
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I have done what ZR2LIFE has done, and ordered several from Rock Auto. In my area they were not in stock when I looked online. With Rock Auto's pricing, it was cheaper to wait. I checked my oil level and it is still at the same level as when I first checked. Oil still looks good for 4500miles.I will still change it out and then go in at 7500miles. I believe the warranty comes with the first service interval within the first year of ownership.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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Discussion Starter #9
Can you cleanly change the oil with removal of just the access panel?
Yes, however the filter might be a little more difficult to remove and install since it's harder to get your hands around it. I used a filter wrench/socket that fits the PF66 perfectly to remove and install the filter. With the right tools it's easy to do the oil change with the splash shield installed, but without the wrench/socket it would definitely be easier with the whole shield removed.

Steve
 

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2021 LT AWD
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I changed mine this weekend and with a strap style filter wrench I had a heck of a time getting it to unthread. I will probably always remove the shielding when I do oil changes. Even with preparing for a new vehicle change. I though I prepared well and oil came out pretty fast and splashed around some. I feel it would get on to the shield and drip after being done. ZR2LIFE was spot on with the tool sizes needed.
One thing that is unique is the drain plug is more of a twist and lock/unlock.
 

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This is just a reference thing. Here is a picture of the new and original filters. New is on the left. I find it funny that they illustrate hand tightening 3/4 to 1 full turn on the new filter. Mine must of been installed by Shrek, or Andre the Giant. Now way when taking mine off that it was at that level of tightness.
I don't know if the red/white labels represent original installs, or if GM decided a design change was needed to freshen up the brand for marketing:D
 

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