An engine's lifespan can benefit greatly from regular oil changes and consistant tune ups but there are other maintenence routines that need to be kept to help the engine to perform at its best.
I've owned Range Rovers that had almost 200K miles on them and they ran well. A few things need to be kept in mind, however. Timing chains don't last forever. In fact, they should really be changed every 100K to insure optimal performance. While you're doing the chain, you might want to consider changing the cam because these trucks love to eat them. Naturally, while you're doing the cam you'll need new lifters and push rods (don't forget to check the pre-load). In the end, if you are able to do this work yourself, you'll greatly extend the engines lifespan, inject new life into it as well and do it all without breaking the bank.
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