2007 MERCEDES-BENZ GL

Typical onset: 60,000-120,000 mi

Symptoms: Metallic rattling on cold start that disappears when warm, Check engine light with cam/crank correlation codes, Sudden catastrophic engine failure with metal shavings in oil, Complete loss of power/seized engine

Fix: The balance shaft gear wears prematurely, sheds plastic teeth into the engine, destroying bearings, cylinder walls, and requiring complete engine rebuild or replacement. Some catch it early with sprocket replacement (15-20 hours labor), but most need full short block or reman engine (30-40 hours). This is THE defining issue of early M273 engines.

Estimated cost: $8,000-15,000

Typical onset: 80,000-130,000 mi

Symptoms: Transmission slipping or harsh shifts, Pink milky residue in coolant reservoir, Transmission overheating warnings, Coolant loss with no external leaks

Fix: The cooler lines corrode internally or the cooler itself fails, allowing coolant and ATF to mix. Contaminated fluid destroys the 7G-Tronic transmission within miles if not caught immediately. Requires new cooler, lines, radiator flush, transmission flush, and often full transmission replacement if cross-contamination occurred (12-18 hours for cooler, 18-25 for transmission).

Estimated cost: $1,800-3,200 (cooler only) or $4,500-7,500 (with transmission)

Typical onset: 70,000-110,000 mi

Symptoms: Heavy clunk when shifting from Park to Drive/Reverse, Vibration at idle in gear, Visible engine/trans movement when accelerating, Rough shift quality

Fix: The hydraulic transmission mount collapses, allowing excessive drivetrain movement. Replacement requires supporting the transmission and removing crossmember (3-4 hours). Often done with engine mounts at same time since access is similar.

Estimated cost: $600-1,000

Typical onset: 90,000-150,000 mi

Symptoms: Vehicle sags overnight or after sitting, Compressor runs constantly, Suspension warning light, One corner lower than others, Rough ride quality

Fix: Airmatic struts develop leaks at the air bladder or piston seals, and the compressor wears out from overwork. Each strut is 2-3 hours, compressor is 3-4 hours. Most replace all four struts plus compressor and relay together when doing the job. Some opt for coil spring conversion kits ($1,500-2,000) to eliminate the system entirely.

Estimated cost: $3,500-5,500 (all four struts + compressor)

Typical onset: 100,000-140,000 mi

Symptoms: Extended cranking before start, Fuel smell near tank, P0087 low fuel pressure codes, Hesitation or stumbling under acceleration

Fix: The fuel pump module assembly corrodes, causing pressure loss or leaks. Requires dropping the fuel tank (4-5 hours). Filter is integral to the pump assembly on this platform and should always be replaced with pump.

Estimated cost: $1,200-1,800

Typical onset: 80,000-120,000 mi

Symptoms: Clunking over bumps, Wandering steering feel, Uneven tire wear on inside edges, Alignment won't hold

Fix: The front lower control arm bushings tear, especially the forward position. Mercedes requires complete control arm replacement (no serviceable bushings). Each side is 2-2.5 hours plus alignment. Most replace both sides together.

Estimated cost: $1,200-1,800 (both sides with alignment)

Typical onset: 90,000-130,000 mi

Symptoms: Battery warning light, Voltage gauge fluctuating wildly, Electrical system going haywire, Dead battery after short drives

Fix: The voltage regulator in the alternator fails, causing overcharging (15+ volts) or undercharging. Can damage battery and electronics if not caught. Alternator replacement is 2-3 hours due to tight engine bay access on the V8.

Estimated cost: $800-1,200