Mercedes Benz Gl 320 Service Costs & Schedule (2026)

Mercedes Benz Gl 320 service: key facts

Oil service every 15,000 miles or 1 year
Basic service costs £180–£450 depending on garage
Automatic transmission fluid: £300–£400 — don't skip this one
1 generation from 2006 to 2012
7 tracked service items across routine, major, and periodic schedules

Routine service items

These are the items covered in a standard service. Most garages include oil, oil filter and a basic inspection. The rest are typically checked or replaced on a schedule.

Service item	Interval	Typical cost
Engine oil and filter Mercedes ASSYST service indicator system calculates variable intervals up to 15,000 miles. X164	15,000 miles or 1 year	£180–£250 Dealer: £350–£450
Air filter Check annually, replace every 30,000 miles or when visibly contaminated. Dirty air filter reduces performance and increases fuel consumption on diesel engines. X164	30,000 miles or 2 years	£40–£60 Dealer: £80–£120
Cabin pollen filter Annual replacement recommended. Blocked filter reduces air conditioning efficiency and causes cabin humidity issues. Located behind glove box. X164	20,000 miles or 1 year	£60–£80 Dealer: £120–£160
Fuel filter Critical on diesel engines. Blocked filter causes power loss and injector damage. Filter incorporates water separator - drain water regularly if indicated. X164	60,000 miles or 4 years	£120–£180 Dealer: £250–£350

Major service items

These are the big-ticket items. Miss them and you risk engine or gearbox damage. The costs are higher but the consequences of skipping are much worse.

Service item	Interval	Typical cost
Automatic transmission fluid Mercedes claims 'lifetime fill' but specialists strongly recommend 80,000 mile changes. X164	80,000 miles or 8 years	£300–£400 Dealer: £600–£800

Has this Mercedes Benz Gl 320 been serviced on schedule?

Check the dealer service records to see if the work above was actually done.

£6.99 · Full refund if no records found

Periodic maintenance

Items that don't need doing at every service but should be on your radar at the right mileage or age.

Service item	Interval	Typical cost
Brake fluid Two-year interval regardless of mileage. Brake fluid absorbs moisture over time, reducing boiling point and causing internal corrosion. Use DOT 4+ specification fluid only. X164	2 years	£80–£120 Dealer: £150–£200
Coolant flush Mercedes specifies 150,000 mile intervals but many specialists recommend 10 years maximum. Use MB 325.0 specification coolant only. Check level annually - expansion tank visible under bonnet. X164	150,000 miles or 10 years	£150–£200 Dealer: £300–£400

Known issues to watch for

The most common problems reported on the Mercedes Benz Gl 320, ranked by severity.

dangerous

Brake pipe corrosion (X164)

The GL 320 uses steel brake pipes that are vulnerable to corrosion from road salt and moisture.

dangerous

Brake hose deterioration (X164)

The flexible brake hoses on the GL 320 connect the rigid brake pipes to the brake calipers at each wheel.

major

CV joint boot deterioration (X164)

The constant velocity (CV) joints at each end of the driveshafts are protected by rubber boots that contain the grease and exclude dirt and water.

major

Shock absorber deterioration (X164)

The GL 320's shock absorbers must cope with the weight of a large SUV and varying load conditions from towing or cargo.

1 more known issues tracked. Check a specific Mercedes Benz Gl 320's service records — a missed service on one of these issues could mean an expensive surprise.

Buying a used Mercedes Benz Gl 320? Check its service history first.

A Gl 320 with a patchy service history can cost you thousands in missed timing belts, skipped oil changes, and hidden neglect. We pull the franchised dealer records — every visit, every stamp, every mileage reading — so you can see exactly what's been done and what's been skipped.

£6.99 · No records found = full refund, zero risk

Mercedes Benz Gl 320 service FAQs

How often does a Mercedes Benz Gl 320 need servicing?

A Mercedes Benz Gl 320 needs servicing every 15,000 miles or 1 year, whichever comes first. Mercedes ASSYST service indicator system calculates variable intervals up to 15,000 miles.

What does a Mercedes Benz Gl 320 service cost?

A basic service at an independent garage costs £180–£250. Main dealer servicing runs £350–£450. Major items like timing belts or gearbox services cost significantly more. Independent garages are typically 30 to 50% cheaper for the same work.

Is a Mercedes Benz Gl 320 expensive to maintain?

Routine servicing starts from £180 at an independent garage, which is above average for this class of car. The bigger costs come from periodic items like timing belts, brake fluid changes, and transmission servicing. Keeping on top of the schedule avoids expensive failures.

How do I check a Mercedes Benz Gl 320's service history?

You can check any Mercedes Benz Gl 320's official dealer service records online using just the registration number. The check retrieves every logged dealer visit, including dates, mileage, and work done, so you can see whether the schedule has been followed or if there are gaps. It costs £6.99 and you get a full refund if no records are found.

Mercedes Benz Gl 320 Service Costs & Schedule