Got a td4 and just got a new battery, only my new one is rated at 75 ah and slightly smaller than the one I took out which was a 80 ah rating. Will it be ok as I did read somewhere that at an absolute minimum you should get 72ah, cheers.
the bigger the amps on a battery means longer lasting while cranking engine over or leaving lights on etc. but your should be ok you will not notice it.