Originally Posted by MassiveMods
The frequency will vary on the materials , how its run in and quality of oils in the fuel you use. In my experience ive had motors last over 35 litres before needing a rod change , others needed one after 15 litres .. the 35 litre one was a tiwanese motor and the 15 litre one was an italian motor.. both were punished equally just one wore more quickly..
Its the fuel, i've put at least 15 litres through my TZ and its still tight!
I change rods when they break?

I have a pet hate for getting those little clips off the gudgeon pin so i prefer to just leave my conrods.