The TSB below doesn't seem to apply to 2016
2.4L GM engines, although there is some history of reported trouble with the engines over the years.
A1O, you said GM recommends a synthetic-blend
dexos1 5w30? There aren't that many blends. Most are full synthetic, but they do exist.
You must have a different TSB than the one below, since I don't see GM insisting the owner find a syn blend oil.
GM usually says to just use any dexos1 5w30 around, so its puzzling how they didn't want full-syns for this.
#13-06-01-003H: Excessive Oil Consumption - Perform Oil Consumption Test and/or Install Piston and Piston Ring Kit - (Feb 9, 2016)
Subject: Excessive Oil Consumption � Perform Oil Consumption Test and/or Install Piston and Piston Ring Kit
Models: 2010-2013 Buick LaCrosse
2011-2013 Buick Regal
2012-2013 Buick Verano
2010-2013 Chevrolet Equinox
2012-2013 Chevrolet Captiva, Orlando (Canada Only)
2010-2013 GMC Terrain
Equipped with 2.4L Engine (RPOs LAF, LEA)
Some customers may comment on excessive oil consumption and/or that they have to add oil between oil changes.
For this condition, technicians should perform an oil consumption test by following the latest version of Corporate Bulletin Number 01-06-01-011. Before starting the oil consumption test, verify the ECM has latest TIS2web calibrations to adjust the engine oil life monitor to a maximum of 7,500 miles (12,070 km) � Refer to the latest version of Customer Satisfaction Bulletin #12312.
Inspect for any obvious oil leaks that may explain the oil consumption concern and repair as necessary.
Important: When checking the oil level with the oil dipstick design shown below, please note that the oil volume per notch is not linear due to the shape of the block. The upper notches (relative to the top of the handle) equal 0.24 quart (0.227 L) between each notch while the lower notches only equal 0.14 quart (0.132 L) between each notch. As a result, no oil will appear on the dipstick if it is low on oil by approximately 1.25 quarts (1.18 L) or more. When determining the oil consumption rate, the oil volume added to return it to the starting location is the total amount of oil consumed. The consumption rate must be documented on a repair order.
Notice: Do not add too much oil. An overfill can lead to burn off of the excess oil. Advise the customer to wait until the oil is below the cross-hatched area at the tip of the dipstick before adding oil.
Object ID: 3339530Click here for detailed picture of the image.
If the oil consumption test indicates that the rate of consumption is greater than 1 quart (0.946 L) of oil every 2,000 miles (3,200 km), note the oil consumption rate, the date that the ECM was reprogrammed and any repairs/diagnosis that you have performed.
The repair is to replace the pistons and rings. In some cases the bore surface may not have a uniform look to the finish (zebra stripes) as shown below. As a result, some technicians may question whether the engine should be repaired or replaced. After careful evaluation, GM Powertrain has determined that the new pistons and rings will perform correctly in bores that have this appearance so engine replacement should not be necessary. The cylinder bores do not need any machine or honing work performed on them. Refer to the picture below for acceptable surface finishes.