Mercedes GLK350 Oil Capacity: What to Know Before an Oil Change
The Short Answer: It Depends on Your Engine
The Mercedes-Benz GLK350 (internal chassis code X204) was not built with a single engine for its entire run, so there is no single oil capacity that applies to every GLK350. In the North American market the model was sold from the 2010 through 2015 model years with two different 3.5-liter V6 engines. The engine change means the oil fill amount differs, and using a figure for the wrong engine can lead to an underfilled or overfilled crankcase.
No verified factory capacity figures were included in the source material for this guide, so this article does not state a specific quart or liter number. The correct value for your vehicle should be taken from the owner's manual, the maintenance booklet or Mercedes-Benz service data for your exact vehicle identification number (VIN). The sections below explain how to identify which engine you have, so you can look up and apply the right figure.
Which Engine Does Your GLK350 Have?
Model years (North America) | Engine family | Notable traits; 2010 to 2012 | M272 3.5-liter V6 | Port fuel injection; rated at about 268 horsepower; 2013 to 2015 | M276 3.5-liter V6 | Direct fuel injection; rated at about 302 horsepower
The 2013 model year brought a mid-cycle update that included the newer M276 engine. Outside North America the GLK 350 badge was available earlier, from the 2008 launch, and engine availability and timing varied by market. If your vehicle was originally sold outside the United States or Canada, confirm the engine from the vehicle's own documentation rather than relying on the model-year split above. Diesel GLK variants, such as the GLK250 BlueTEC, use entirely different engines and are not covered here.
How to Confirm Your Engine and Oil Specification
Check the model year on your registration or the VIN plate; for North American cars this is the quickest indicator of M272 versus M276. Decode the VIN through a Mercedes-Benz dealer or a reputable VIN decoder to confirm the factory engine code. Look at the horsepower rating listed in the owner's manual or original window sticker. Read the maintenance section of the owner's manual, which lists the oil capacity and the required Mercedes-Benz oil approval for that vehicle. Ask a dealer service department to pull the specification for your VIN if the manual is missing.
Mercedes-Benz engines require oil that carries a specific Mercedes-Benz sheet approval number, printed on qualifying oil containers. The approval that applies to your GLK350 should be confirmed in the owner's manual or with a dealer, since matching both the capacity and the approval matters for engine protection and warranty or service records.
Locating the Oil Fill Point and Checking the Level
The oil filler cap sits on top of the engine under the hood and is typically marked with an oil can symbol. Do not confuse it with the coolant reservoir cap or the windshield washer fluid cap, which are separate and usually labeled with their own symbols. Exact placement can vary between the M272 and M276 engines, so check the engine compartment diagram in the owner's manual for your model year.
Some later Mercedes-Benz engines rely on an electronic oil level check through the instrument cluster rather than a traditional dipstick. Whether your GLK350 has a dipstick, an electronic readout or both should be verified in the owner's manual for your model year, as the source material for this guide did not confirm this detail.
Practical Tips When Refilling
Treat any published capacity as an approximate refill amount with a new filter; actual fill can vary slightly depending on how much old oil drained out. Add most of the specified amount, run the engine briefly, let it settle on level ground, then check the level and top up gradually. Avoid overfilling, which can cause foaming and other problems; underfilling is equally undesirable. Record the oil type, approval number and amount used for your service history.
Information Gaps
This guide confirms that GLK350 oil capacity depends on whether the vehicle has the M272 or M276 engine, but it does not provide verified capacity figures, oil approval numbers or dipstick details, because none were supplied in the supporting documentation. Use your owner's manual or Mercedes-Benz service data for those values before performing an oil change.