Keep the Cooling System serviced and you will get a lot more than that.
My 1985 Bumby is still used every day with an estimated (odometers were a problem with the earlier ones) 500,000km. Original Engine, Transmission, Diff. and Front Struts. I bought it in 1992 with an odometer stopped at 180,000km.
First thing I did was to fit brass Welch Plugs and re-tension the Cylinder Heads. Changing the Coolant every 2 years and regular servicing since then seems to have paid off.