Check the Engine Oil Level (No Dipstick)

The Mercedes-Benz GLC (X253, 2015–2022) has no engine oil dipstick — you read the level electronically from the instrument-cluster menu. It catches a lot of owners out, because there is simply nothing to pull and wipe under the bonnet, and the only way to know where the oil sits is to ask the car. That is normal for this generation and not a fault. Once you know the menu path and the couple of conditions the sensor needs to give a true reading, checking the oil is quick and just as reliable as a traditional stick — arguably more so, since the reading is taken from a sensor in the sump rather than by eye.

Why There’s No Dipstick

A sensor in the sump measures the oil level and the car displays it on the dash. It’s accurate, but only when the engine is warm and the car is on level ground — check it wrong and you’ll get a misleading reading. The reason is simple: oil drains back into the sump slowly and its volume changes with temperature, so the sensor is calibrated to read correctly when the oil is hot and settled and the car is sitting flat. Cold oil, a slope, or a check taken straight after switching off all throw the figure out. Get those conditions right and the electronic gauge is trustworthy.

Before You Start

• Warm the engine to normal operating temperature — a short cold-start check will read low and mislead you.
• Park on level ground, not on a driveway slope or camber, so the sump sits flat under the sensor.
• Let the engine idle as the menu asks, rather than reading it the instant you stop.
• Keep the correct oil to hand only if you expect to top up — use the specification listed in your handbook for your exact engine.
• Have the handbook accessible so you can confirm the grade and not guess at capacity.

How to Check the Oil Level

1. Park on a level surface with the engine at normal operating temperature, then let it idle.
2. Open the cluster menu with the steering-wheel controls.
3. Go to ‘Service’ and select ‘Oil level’ (Engine oil level).
4. Wait while the car measures — it shows the level as OK, or how much to top up (or that it’s over-full).

Topping Up

• Add the correct approved oil for your engine (check the handbook for the exact specification) a little at a time.
• Re-measure after a few minutes; don’t overfill — too much oil is as harmful as too little.

If the Reading Looks Wrong

• Cold engine or a slope — the sensor needs the car warm and level; re-check.
• ‘Measurement not possible’ — let the engine idle a little longer and retry.
• Reading jumps between checks — the oil may not have fully settled; give it a couple of minutes at idle and measure again.
• Just topped up? Wait for the fresh oil to drain down before re-measuring, or it will read high.
• Consistently low despite topping up — look for leaks or oil consumption and have it investigated rather than repeatedly adding oil.

What to Expect After

A correct reading shows the level as OK, or tells you a specific top-up amount, or warns that it is over-full. Add oil in small amounts and re-measure each time until it reads OK — it is far easier to add a little more than to remove an overfill. Once the display confirms the level is right, you’re done. Make a habit of checking every few weeks and before long trips, since the sensor makes a regular check effortless.

Frequently Asked Questions

How do I check the oil on a Mercedes GLC with no dipstick?

Warm the engine to operating temperature, park on level ground and let it idle, then open the cluster menu with the steering-wheel buttons and select Service, then Oil level. The car measures with a sump sensor and shows OK, a top-up amount, or an over-full warning.

Why does my reading change?

The electronic check depends on the oil being hot and settled and the car being level. A cold engine, a sloped parking spot, or a measurement taken too soon after switching off will all skew the figure. Repeat the check with the engine warm, at idle, on flat ground.

What oil does it take?

An approved specification for your particular engine — the petrol and diesel units call for different grades. Check your handbook for the exact specification and capacity rather than guessing, and buy oil that clearly states it meets that approval on the bottle.

Can I overfill it?

Yes, and overfilling is genuinely harmful — it can aerate the oil and stress seals, just as running low starves the engine. Always add oil in small amounts, wait for it to drain down, and re-measure. Stop as soon as the display reads OK.

How often should I check it?

Every few weeks and before any long journey is sensible, and more often if the engine is known to use a little oil between services. Because there is no dipstick to pull, the menu check is quick, so there is no reason to skip it.

The menu says measurement is not possible — what now?

That usually means the conditions aren’t met yet. Let the engine idle a little longer so the oil warms and settles, make sure the car is level, and try again. If it still refuses after the oil is fully warm on flat ground, have the oil-level sensor checked.

Doing an oil change? Reset the counter afterwards with our GLC service reset guide. For warning lights, look up the code on autodtcs.com.