Levin is 100% right with his statement, changing oil is a little time consuming and expensive business outside of Pakistan. Speaking of which, the Probox that you have bought is a delivery vehicle mostly and is made on a disposable attitude, you wont find any sound insulation in it and the engine and transmission will show signs of high wear sometimes too.
I work on my cars myself and change oils etc, I order filters over the internet and buy oils in discount prices from schemes etc. If I took it to the dealership the oil change bill would be a little out of hand, and the regular jiffylube/firestone shops have monkeys doing work - I wont trust them.
a price breakup
car = Nissan Altima CVT2.5 2010
dealer pricing for oil change
filter = USD 12/-
washer for sump plug = USD 1/-
mineral oil 5 qt (5W30) API SM or SL = USD 5x5 = 25/-
oil recycling fee = USD 2/-
labour = USD 15/-
calculating to USD 55/- (which is a pretty amount)
filter MANN USD 5/-
5qt oil = USD 14 (Walmart)
washer (USD 3 for a 6 pack)
labour = free
oil recycle fee = free
totalling USD 19/- (acceptable amount) but not everyone changes their own oil.
even worse for MB
online filter = USD 8
dealer filter = USD 30
8 litres engine oil (sale price = 12x2)
dealer price = USD 100/- (for the same mineral oil)
labour = USD 25/-
recycle fee USD 5/-
so its not all hunky dory as everyone assumes when buying these japanese orphan cars.