Normal running and servicing costs for the R35 GT-R are not that scary.
There are numerous specialists, Litchfields, SVM, and Kaizer to name a few, who can service and maintain these cars at reasonable costs.
The cars run practically trouble-free, including the early cars, the majority of which have had all the known issues sorted.
Unless you are tracking the car or driving like you have stolen it, the tyres and brake pads will last at least a year or circa 12,000 + miles.
I maintain quite a few GT-Rs and in particular a 2014 GT-R which has covered only 18,000 miles which belongs to a friend of mine and the brake pads are not even half worn and the tyres have just been replaced for the first time as it was due its MOT and he did not want any advisories, even though there was still 3mm left on them.
A set of branded tyres will set you back £800.00 upwards.
Annual servicing costs are very reasonable, examples including labour, parts and vat. below:
My view is if you can comfortably afford the purchase price of a well maintained, average to low mileage GT-R at circa 40K then you can afford the running costs, however, if you buy an unloved example, then of course extra expense may be incurred.
Cars for sale at say circa 28K are cheap for a reason and always flags up buyer beware.
Getting back on track, a proper unmolested, well maintained, low mileage R35 GT-R will cost circa 40K upwards.
My view is that the values are steady and I would not envisage any drastic depreciation in the near future of residual values of well-maintained cars, with sensible mileage and FSH.
12,000 miles: £297.00
24,000 miles: £415.00
36,000 miles: £726.00 (includes both diff and gearbox fluids)
48,000 miles: £415.00
60,000 miles: £854.00 (includes brake hoses and Spark Plugs)
72,000 miles: £828.00 (includes both diff and gearbox fluids)