What appear to be the first details of Mazda’s upcoming range of straight-six engines have emerged online in a seemingly leaked slide.

The admittedly unverified image posted on cochespias.net suggests the Japanese firm is planning to offer two inline-six powerplants.

According to the post, the first is a 3,3-litre turbodiesel mill, wearing Mazda’s Skyactiv-D badge and generating 210 kW and 600 N.m.

The second seems to incorporate the company’s latest Skyactiv-X compression-ignition petrol technology. The post suggests this 3,0-litre unit will feature a 48 V mild-hybrid system, with peak outputs listed as 210 kW and 340 N.m.

The slide also makes mention of three other powertrains: the existing 2,2-litre four-cylinder turbodiesel unit (140 kW/450 N.m); a 169 kW/420 N.m version of the turbocharged 2,5-litre four-cylinder petrol engine offered in some markets; and a 140 kW/270 N.m version of the naturally aspirated 2,5-litre four-pot petrol mill but also featuring 48 V mild-hybrid tech.

In May 2019, Mazda confirmed it planned to build inline-six petrol and diesel engines, while also hinting it would develop a new rear-wheel-drive platform for large vehicles.

Subsequent reports have claimed the next-generation Mazda6 will be underpinned by this new longitudinal-engine platform, while the latest post on cochespias.net claims the follow-up to the current CX-5 will also switch to this architecture.