Maruti Brezza 2026 1.5L Petrol Engine: Power, Torque, Efficiency

While the Boosterjet turbo has grabbed most of the attention in this facelift, the naturally aspirated 1.5-litre petrol remains the Brezza’s default engine, and for a lot of buyers, it’s still the more sensible choice. Here’s a straight look at what it actually offers.

Engine Overview

The Brezza continues with the K15C, a 1.5-litre, 4-cylinder naturally aspirated petrol engine, producing 103 PS of power and 139 Nm of torque. This engine has been part of the Brezza’s lineup since the current generation launched in 2022, and it carries over into the 2026 facelift largely unchanged mechanically. It’s available with either a 6-speed manual gearbox or a 6-speed torque converter automatic, making it the only engine in the entire Brezza range that offers an automatic transmission option at all.

Power and Torque: What the Numbers Mean in Practice

103 PS and 139 Nm are respectable, if unremarkable, figures for this segment. Naturally aspirated engines like this one build power progressively as revs climb, rather than delivering a strong surge of torque low in the rev range the way a turbocharged engine does. This means the K15C rewards a slightly different driving style, you’ll generally need to rev it a bit more to access its full performance, particularly when overtaking or climbing an incline with a full car.

This isn’t a criticism so much as a description of its character. The naturally aspirated engine has always been adequate rather than eager in the Brezza, smooth and predictable rather than punchy. For buyers who don’t need outright urgency in daily driving, that smoothness is a genuine positive, not a compromise.

Mileage: The Best Figure in the Petrol Lineup

This is worth highlighting clearly: the naturally aspirated manual’s 21.09 kmpl figure is actually the best ARAI mileage across the entire Brezza petrol lineup, ahead of the Boosterjet turbo’s 19.96-20.47 kmpl. If outright fuel efficiency on petrol is your primary concern, the K15C manual is the correct choice, not the turbo, despite the turbo often being assumed to be the more “efficient” modern engine by buyers unfamiliar with how the two actually compare on this specific car.

As with any ARAI figure, real-world mileage will typically come in lower, particularly in heavy city traffic with the air conditioning running. The naturally aspirated engine tends to be somewhat less sensitive to aggressive driving style than the turbo, so the gap between its ARAI figure and real-world mileage is often, though not always, a bit more forgiving than on the Boosterjet.

The Only Automatic in the Brezza Range

This is arguably the K15C’s biggest practical advantage over the Boosterjet. If a torque converter automatic gearbox is a requirement rather than a preference, there is currently no other way to get one in the Brezza 2026 lineup, the turbo is manual-only, and CNG is also manual-only. Anyone who wants to avoid clutch work in traffic while staying within the Brezza range needs the naturally aspirated 1.5-litre.

Torque converter automatics are generally well regarded for smoothness in stop-start traffic, arguably a better match for the K15C’s own smooth, progressive power delivery than a jerkier alternative like an AMT would be. It’s a sensible pairing for buyers prioritizing comfort in daily commuting over outright performance.

How It Compares to the Boosterjet Turbo

The naturally aspirated engine wins on outright mileage and gearbox flexibility. The turbo wins on torque and low-end responsiveness. Neither is categorically better, they suit different driving patterns, covered in more depth in the dedicated Brezza engine comparison guide.

Frequently Asked Questions