The BMW 7-Series has been on the market for four years, so the company is preparing to introduce a minor facelift for the aging model.

The BMW 7-Series has been on the market for four years, so the company is preparing to introduce a minor facelift for the aging model.

Recently spotted undergoing testing, the updated sedan has new bumpers and restyled lighting units.

While the exterior styling changes are modest, we can expect significant improvements under the hood. Chief among them is the rumored availability of the tri-turbo 3.0-liter six-cylinder diesel engine - with 381 PS (280 kW / 375 bhp) and 740 Nm (546 lb-ft) of torque - that recently debuted in the company's M Performance Automobiles lineup. The petrol engines should also see some minor modifications to increase their output and fuel efficiency.

The 2013 BMW 7-Series will be unveiled later this year, so stay tuned for additional information.

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