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3 WORST and 4 BEST GMC Engines You Can Buy (Avoid These!)
Shopping for a GMC truck? Some GMC engines will last 400,000 miles without major repairs, while others fail before 150,000 miles. In this video, I break down the 3 worst GMC engines you should avoid and the 4 best GMC engines that will last a lifetime.

Not all GMC engines are created equal. The difference between a bulletproof GMC engine and a catastrophic failure comes down to three letters stamped on your VIN plate. If you're buying a used GMC Sierra, GMC Yukon, or any GMC truck, you need to know which engines to avoid and which engines are worth buying.

I've analyzed failure rates, owner reports, mechanic feedback, and long-term reliability data across every major GMC engine from 1999 to 2026. What I found is shocking: some of the newest GMC engines have the highest failure rates, while some of the oldest GMC engines are still running strong past 300,000 miles.

In this video, I cover:
✅ The 3 worst GMC engines with the highest failure rates
✅ The 4 best GMC engines that routinely run 300,000+ miles
✅ Specific problems each bad engine has (lifter failure, timing chain issues, oil consumption)
✅ Why these engines fail and what it costs to repair
✅ Which GMC trucks to avoid based on engine type
✅ Which GMC trucks are the safest long-term investments
✅ Exact model years to buy and avoid

The 3 WORST GMC Engines:
2.7L Turbo 4-Cylinder (2019-Present): Timing chain stretch, turbo failure, carbon buildup
5.3L V8 with AFM (2007-2013): Active Fuel Management lifter failure, oil consumption
6.2L V8 L87 (2019-Present): Catastrophic lifter failure, valve spring issues, carbon buildup

The 4 BEST GMC Engines:
4.8L V8 (1999-2013): Simple, reliable, 300,000+ mile lifespan
6.0L V8 (1999-2019): Proven durability, strong internals, minimal issues
6.6L Duramax Diesel LB7/LLY/LBZ/LMM (2001-2010): Legendary longevity, 400,000-500,000 miles
5.3L V8 LM7/L33/LH6 (1999-2007): Most reliable GMC engine ever built, 400,000+ miles

If you're shopping for a GMC Sierra, GMC Yukon, GMC Canyon, or any GMC truck, this information could save you $8,000 in engine repairs. I break down exactly why each bad engine fails, what the repair costs are, and which good engines will give you decades of reliable service.

This isn't about brand loyalty or marketing hype. This is real data from mechanics, owner forums, and long-term reliability studies. Whether you're buying new or used, this video will help you avoid the biggest GMC engine mistakes buyers are making right now.

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