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Chevrolet Tahoe

L84 5.3L V8 EcoTec3 355 hp Automatic SUV 2021–2025
✖ Stay Away!
Engine L84 ✖ Stay Away! 8,500–25,500 $

5.3L V8 EcoTec3 — the heart of GM trucks, world's best-selling truck engine. AFM (2014-2018) or DFM (2019+) cylinder deactivation is THE problem: lifter failure from oil starvation in deactivated cylinders. Two active class action lawsuits (lifters + oil consumption). Engine mechanically robust when AFM/DFM is disabled (delete kits available). Oil pressure and short change intervals are survival-critical.

Fun Factor? Decent

Tahoe T1XX 5.3 — new IRS suspension, same lifter problems

355 hp with new independent rear suspension: significantly more comfortable than predecessor. DFM lifters and 10-speed shudder remain. Check recall 26V085 for rear wheel lockup.

Engine Weaknesses 3

!! AFM/DFM Lifter Failure — Class Action

THE GM truck problem: deactivated cylinder lifters wear from oil starvation. Needle bearing skids on cam lobe, metal debris in oil. Two class actions pending. $3,500-8,500 repair. AFM/DFM delete kit as permanent fix.

Symptoms: Loud ticking/knocking, misfires, rough running, check engine, sometimes from just 25k miles

3,500–8,500 $ from 100,000 km
!! Oil Consumption — Piston Rings (Class Action)

Separate class action: $150M settlement for 2011-2021. Piston rings let oil pass — 1 quart per 2,000 miles in severe cases.

Symptoms: Blue smoke, dropping oil level, fouled spark plugs

2,000–6,000 $ from 80,000 km
!! Timing Chain Wear

Same issue as LV3 — chain and guides from ~100k miles.

Symptoms: Cold start rattle, P0008/P0016

1,000–2,500 $ from 160,000 km

Vehicle Weaknesses 1

!! Gearbox 10-Speed Shudder

Same 10L80 issue as Silverado T1XX. Recall 26V085.

2,000–8,500 $ from 50,000 km