Mercedes is set to unveil a mildly facelifted version of the second-generation ML-Class at this week’s New York motor show. The upmarket SUV has already racked up an impressive 300,000 sales worldwide since it was launched 2005. However, strong competition from the Audi Q7 and second-generation BMW X5 has seen Merc tweak the ML’s appearance and add more spec to boost its showroom appeal until a third-generation model arrives in 2012. The biggest revision is a lightly altered front end with a re-profiled bumper, larger projector beam headlamps, more prominent three slat grille and new fog lamps. Changes at the back are similarly subtle – with new tail lamp lens design and a deeper bumper. Merc’s Pre-Safe occupant protection system and NeckPro anti-whiplash headrests will be standard. Optional equipment includes an entertainment and sat nav package that includes Merc’s latest telematics.Engine choices remain as before, with 3.5- and 5.5-litre petrol units alongside 3.0, 3.2- and 4.2-litre common rail diesels. They are joined by a facelifted version of the range topping 6.2-litre V8 powered ML63 AMG boasting a bold new body kit, standard 20-inch wheels and a revised interior.