7 Cars Known for Engine Trouble That You Should Avoid
If you’re shopping for a used car—or even a newer model—you’ll want to steer clear of serious engine trouble that can cost thousands and wreck your peace of mind. Some vehicles have earned well-deserved reputations for chronic issues before even hitting 100,000 miles. In this article, we highlight seven cars notorious for engine trouble, why these issues happen, and what you can do to avoid ending up stranded. It’s your guide to smarter, safer car buying—no regrets included.
1. Chevrolet Equinox & GMC Terrain (GM 2.4L Ecotec)
The 2.4-liter Ecotec engine in the Chevy Equinox and GMC Terrain is infamous for engine trouble. Mechanics report repeated overheating, thermostat housing leaks, carbon build-up, and oil-burning issues. In many cases, that leads to premature engine failure or expensive rebuilds in the $4,000+ range. While GM introduced updates in later models, older units remain risky for buyers. If you’re eyeing one of these compact SUVs, insist on a service history that shows cooling system replacements.
2. Hyundai & Kia Theta II 2.4L
From about 2011 to 2019, the Hyundai Sonata and Kia Optima equipped with the Theta II 2.4L engine saw serious problems. Manufacturers admitted to metal debris contaminating engines, causing seizing or even complete failure. Affected owners often faced full engine replacements. If you want a smooth drive, skip these models unless you confirm they’ve had the updated engine installed.
3. Ford 1.6L EcoBoost
Ford’s 1.6L EcoBoost engine—found in Fiesta, Escape, Fusion, and Transit Connect—makes for peppy driving but has minted headlines for coolant leaks, overheating, and even engine fires. Frequently, coolant mixes with oil when seals break, leading to catastrophic damage. Many buyers report constant limp-mode warnings and premature failure. For peace of mind, opt for more reliable, older naturally aspirated engines.
4. BMW N54 Twin-Turbo 3.0L
The prestigious-sounding N54 engine in models like the 335i may offer thrills, but it comes with its fair share of grief. High-pressure fuel pumps (HPFP) often fail, causing the engine to suddenly stall or go into limp mode, spurring a class-action lawsuit and recalls. Even with extended warranties, repeated HPFP replacements made many owners ditch the model. If you’re not ready for frequent repairs, this might not be your dream BMW.
5. Toyota 2AZ-FE 2.4L
Despite Toyota’s strong reputation, the 2AZ-FE 2.4L engine found in 2006–2009 Camry and RAV4 models is a notable exception. It suffers from high oil consumption—burning more than a quart per 1,200 miles—and led to a warranty enhancement to manage it. Owners report having to top up oil frequently despite normal mileage. While not an immediate engine killer, the inconvenience and potential for damage make it a headache-filled ownership experience.
6. Chrysler/Dodge 2.7L LH V6
Chrysler’s 2.7L LH-series V6, used in many early-2000s Chrysler minivans and Dodges, accumulates oil sludge fast, wrecking engines in the process. Its design suffered from poor ventilation and internal coolant leaks, allowing sludge to form. This sludge blocks oil flow and leads to catastrophic engine damage. Independent shops often refuse these engines outright, considering them “ticking time bombs.” Buyers should avoid unless the owner performs runway maintenance religiously.
7. Mercedes-Benz M272 V6 (2004–2008)
The M272 engine powering mid-2000s Mercedes C, E, and S-Class models is infamous for balance-shaft gear wear, which causes misfires and breakdowns costing over $4,000. A class-action lawsuit followed, but many vehicles left the warranty with no fix done. Later, camshaft and intake manifold failures added up. If you’re drawn to a used Mercedes, pick post-2008 updates—or be ready to pay dearly when the balance shaft goes.
Think Twice—and Buy Smart
Even if a car seems like a great deal, serious engine trouble could cost you far more down the line. That Chevrolet Equinox with the 2.4L Ecotec? It might be running fine now, but its history says otherwise. The same goes for those sleek BMWs and early-2000s Chrysler vans. Do yourself a favor: avoid known engine trouble makes and models, or buy only if previous owners replaced the trouble components.
Next time you’re shopping, type the model and year into a search like “NHTSA complaints” or “reliability forum.” Ask sellers if key engine parts were replaced (timing chain, HPFP, coolant system). Request a compression test and a recent oil consumption report. That’s how smart buyers avoid surprise bills—and avoid becoming part of the problem.
Have you ever owned—or narrowly avoided—a car with engine trouble? Share your story and advice in the comments below!
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