Hi Sue, regarding the smoke, could be a number of things but off the top of my head:
Fuel Quality, I find I get a quite a bit of smoke if I fill up at certain service stations.
MAF Sensor, some times these give problems.
EGR valve, problematic in the earlier "Pumas" (2007 on vehicles)
Turbo wiring harness, some 2010 models had problems with these failing.
Either way, get the dealer to look at it while they are changing your diff pinion seal.
Cheers,
Tim



Just smart because you actually asked for help


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