You also have to wonder, "did they change the oil correctly?"
Some workers suck the oil out with a suction tube...does that get it all?
And then, do they pour the first few quarts down the filter hole?
Do they drip any on the alternator, located right under the fill cap?
This can cause premature alternator failure.
2007 WK CRD, Quadradrive II, OEM Tow Hitch, GDE EcoTune, DPF-Delete, 4xGuard Front, Rear, Belly Guards, Side Rails & Full Matrix, OEM Skids, EHM, Dash Duck.