Not even the opulent Cadillac Escalade can remain insulated from rising gas prices and fuel economy regulations. GM is considering adding a turbodiesel V6 to the 2015 Cadillac Escalade, as well as a sporty twin-turbo V6 model, reports Automotive News.

GM has been slowly dipping its toes into the diesel market, first with the Chevy Cruze Diesel, and then the upcoming Chevy Colorado and GMC Canyon mid-size trucks. Dropping an oil-burner into the Cadillac Escalade would be a big next step though, and would help the brand move more models oversea, where diesels have historically been more welcome.

As for a twin-turbo V6 model, it could lift the performance of the Escalade, which is currently only offered with the 6.2 liter V8. It would also help the 2015 Escalade compete with its chief rival, the Lincoln Navigator, which itself just got Ford’s 3.5 liter EcoBoost engine. It seems GM is trying to keep the Escalade relevant to the world at large, which means smaller and more efficient engines that don’t skimp on performance.

So where would this V6 turbodiesel come from? That’s the real question. GM recently got out of the turbodiesel business, handing the reins over to Fiat-Chrysler, which put the VM Motori 3.0 liter V6 turbodiesel under the hood of the Jeep Grand Cherokee and Ram 1500 pickup. The 2.8 liter turbodiesel going into the Colorado/Canyon probably doesn’t fit the bill either, as its an inline-four.

Does GM have a secret V6 turbodiesel engine ready to propel the 5,000 pound mansion-on-wheels that is the 2015 Cadillac Escalade? Or has the General been caught flat-footed by the sudden popularity of diesel engines?