The Tata Harrier and its three-row sibling, the Safari, have carved a powerful niche in the Indian SUV market. Praised for their commanding road presence, robust build quality, and feature-rich interiors, a critical component at the core of their appeal is the potent 2.0-litre diesel engine. Dubbed the "Kryotec 170," this engine is the sole powertrain option for these flagship SUVs.

But for a potential buyer looking at a long-term relationship with their vehicle, the most pressing question is: How reliable is this engine really? Let's take a deep dive.

The Proven Lineage: Not a New Kid on the Block

The first and most crucial point to understand is that the "Kryotec" engine is not a brand-new, untested power plant developed from scratch by Tata Motors. It is, in fact, the Indian automaker's version of the highly acclaimed 2.0-litre MultiJet II diesel engine from Fiat Chrysler Automobiles (FCA), now Stellantis.

This is a massive point in its favour. This same engine block, with different states of tune, powers a range of globally respected vehicles, including:

• Jeep Compass: The very car the Harrier was benchmarked against.
• MG Hector: Another key competitor in the same segment.

This shared lineage means the engine has been subjected to millions of kilometres of real-world testing across different brands and driving conditions. Its fundamental mechanical components—the block, pistons, and crankshaft—are known for their durability and robust engineering.

On-Road Performance and Drivability

In the Harrier and Safari, the engine is tuned to produce 170 PS of power and a hefty 350 Nm of torque. This translates to a strong and effortless driving experience, especially on the highway. The engine has a potent mid-range, making overtakes a breeze. Whether paired with the 6-speed manual or the smooth Hyundai-sourced 6-speed torque converter automatic, the powertrain feels capable and unstressed.

For long-distance touring, this engine is an excellent companion, munching miles without breaking a sweat.

The Modern Diesel Challenge: DPF and DEF

The conversation around long-term reliability for any modern BS6-compliant diesel engine is incomplete without mentioning the Diesel Particulate Filter (DPF) and Diesel Exhaust Fluid (DEF), or AdBlue.

1. Diesel Particulate Filter (DPF): The DPF is essentially a soot trap in the exhaust system, designed to capture harmful particulate matter. To clean itself, it undergoes a process called "regeneration," where it heats up to burn off the collected soot.
   • The Reliability Concern: This process requires the engine to run at a sustained higher RPM, typically achieved during a 20-30 minute highway drive. If the vehicle is used exclusively for short, low-speed city commutes, the DPF may not get a chance to regenerate, leading to clogging. This can trigger warning lights and, in severe cases, force the car into "limp mode."
   • Is it a Harrier/Safari problem? No, this is a characteristic of all modern BS6 diesel engines. Owners who primarily drive in the city need to be mindful of taking the car for a good highway run every few hundred kilometres to keep the DPF healthy.
2. Diesel Exhaust Fluid (DEF/AdBlue): This is a urea-based solution injected into the exhaust to reduce harmful NOx emissions. The Harrier and Safari have a dedicated DEF tank that needs to be refilled every few thousand kilometres.
   • The Reliability Concern: Running the vehicle without DEF will cause it to not start. While the system itself is reliable, issues can sometimes arise from faulty sensors, which can be an inconvenience. It's an additional maintenance item to keep track of.

Long-Term Owner Feedback and Common Niggles

Based on feedback from long-term owners in various forums and communities, the consensus is clear:

• Core Engine is Rock-Solid: Major mechanical engine failures are extremely rare. The Fiat-sourced block is dependable and built to last.
• DPF Warnings are Common: The most frequent "engine-related" complaint is the DPF warning light, almost always linked to a predominantly city-based driving style. This is usually resolved with a forced regeneration at the service centre or a long drive.
• Tata's Service Network: Sometimes, the perception of unreliability stems not from the engine itself but from the after-sales service experience. While Tata has improved significantly, the diagnostic skills and service quality can be inconsistent across different service centres.

The Verdict: Is It Reliable for the Long Term?

Yes, the 2.0L Kryotec diesel engine in the Tata Harrier and Safari is fundamentally reliable for long-term ownership.

Its reliability is built on the strong foundation of the proven Fiat MultiJet II engine. The primary "challenges" for an owner do not stem from the engine's mechanicals but from the sensitive emissions control systems (DPF/DEF) mandated by BS6 norms.

Here’s how to ensure a trouble-free experience:

1. Match Your Driving Style: This engine is at its best for those with a significant amount of highway driving or a mixed-use cycle. If your usage is 100% short city trips, any modern diesel might give you DPF-related headaches.
2. Follow the Service Schedule: Use only the recommended grade of engine oil and adhere strictly to the service intervals.
3. Don't Ignore Warnings: If a DPF or engine check light comes on, get it diagnosed promptly.
4. Keep DEF Topped Up: Treat AdBlue just like fuel. Don't let it run dry.

In conclusion, if you're in the market for a Harrier or Safari, you can be confident in the heart of the beast. The Kryotec engine is a robust, powerful, and dependable unit that, with the right care and understanding of its modern emissions systems, will serve you reliably for many years and countless miles.