The revised Lexus IS range appears set to receive another engine for its line-up, with a trademark application sighted by forum The ‘500’ suffix could point to a number of engines already being used in the wider Lexus range, and this currently includes the naturally aspirated 5.0 litre V8 as well as the 3.5 litre twin-turbo V6 that is used in the LS 500 flagship sedan.

The biturbo petrol V6 produces 415 hp at 6,000 rpm and 500 Nm of torque from 1,600 rpm to 4,800 rpm in the LS 500, paired to a 10-speed torque converter automatic. The most potent version of the latest IS is currently the 3.5 litre naturally aspirated V6 version, producing 311 hp and 380 Nm of torque, paired to an eight-speed automatic in RWD form and a six-speed auto in AWD guise.

No ‘h’ suffix here, so this will be for a purely internal combustion engine variant. The other possibility, and likely the hope of traditional enthusiasts, is the 5.0 litre NA V8 that powers the LC 500, producing 470 hp at 7,100 rpm and 540 Nm of torque at 4,800 rpm.

The naturally aspirated V8 from the Lexus LC 500 likely won’t make it into the IS 500, as this is due to be retired in two years.

This 2UR-GSE powerplant has been reported by a Japanese magazine to be retired from the LC in two years, therefore this is unlikely. The twin-turbo V8 that will replace this at the top of the LC tree won’t be it either, as the trademark filing is for a non-F model.

Speculation surfaced last year – before the arrival of the IS facelift – that the 3.0 litre turbocharged inline-six in the G29 Z4 and A90 Supra is a possible new addition to the selection of engines in the IS range. This was on the assumption that the facelifted sedan would debut on the Toyota New Global Architecture (TNGA) platform for FR (front-engined, rear-wheel-drive) cars, but that too has emerged not to be the case.

This leaves the twin-turbo V6 mill as the most likely candidate, and the ‘IS 500’ will thus go up against the turbocharged Germans like the Mercedes-AMG C 43 4Matic, which packs 385 hp and 520 Nm of torque from its 3.0 litre biturbo V6, as well as the BMW M340i xDrive that produces 369 hp and 500 Nm of torque. The Audi S4 has gone diesel, its 3.0 TDI making 354 hp and 700 Nm.

GALLERY: 2021 Lexus IS