You're not listening mate...
Patrol and Cruiser of similar vintage will also need maintenance.
The Disco is no worse in this regard.
What you need to do is LEARN and buy tools... Often the money saved from a mechanics pocket pays for the tools.
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Doesnt matter what you get at the end of the day
If you buy an older vehicle you either
a, become very good friends with lots of people with mechanical know how
b, pay lots to mechanics
c, learn to DIY