DiRT Rally 2.0 Engine Upgrades - distance required to unlock

Apologies if this is a basic question. I've Googled and Googled - but can't find an answer.

What distance do you have to drive, in any given car, to unlock stages II - IV of the Engine Upgrades?

I have Dirt 2.0 with various DLC (GOTY Edition), but in the interests of unlocking things at the right time, I am stripping back the 'starter content' and only want to enable myself to unlock stage II once I've put the relevant miles in.

Can someone advise?
 
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