Congratulations on the purchase - that's a nice looking car 
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About the DSC / DTC issue; I've just had a quick look in the handbook. It's definitely a good idea to leave the DSC on. But the book says the following about the DTC:
"DTC is a traction-optimised version of DSC intended for use in special circumstances, such as roads covered by deep snow. Under these circumstancesthe system ensures maximum forward traction, but at a certain cost in terms of stability. Consequently, you must exercise suitable caution when driving under these conditions.
"In the following exceptional situations it may be best to activate DTC for a short time:
i. When driving uphill on snow-covered roads, in slush or on unploughed, snow-covered roads.
ii. If the car has to be rocked out of or started in deep snow or on a loose surface.
iii. If snow chains are fitted."
So, contrary to what I thought, it seems that DTC should normally be switched off. Hope this helps
.About the DSC / DTC issue; I've just had a quick look in the handbook. It's definitely a good idea to leave the DSC on. But the book says the following about the DTC:
"DTC is a traction-optimised version of DSC intended for use in special circumstances, such as roads covered by deep snow. Under these circumstancesthe system ensures maximum forward traction, but at a certain cost in terms of stability. Consequently, you must exercise suitable caution when driving under these conditions.
"In the following exceptional situations it may be best to activate DTC for a short time:
i. When driving uphill on snow-covered roads, in slush or on unploughed, snow-covered roads.
ii. If the car has to be rocked out of or started in deep snow or on a loose surface.
iii. If snow chains are fitted."
So, contrary to what I thought, it seems that DTC should normally be switched off. Hope this helps
