Got back from the cape n all I needed was a wash n fuel, I bought a $20 snorkel sock Uni Filter brand n washed it out each night after setting up camp n man every-1 was amazed just how much dirt was coming out each day even though I was only second car in convoy. they checked theirs after 3 days as they were sitting way too close behind me & had to change their filters n blow them out bout 8 times over 3 weeks & I have gone from Cairns to cape then back to Lismore NSW then on to Bathurst n back n my main filter is still clean with bugger all dust in it. so If I was to buy anything it'd be another snorkel sock as it saved me heaps of fuel n drama's. My average over the 6n abit thousand k's towing 1500kg trailer with 2500kg rig n gear was 13.4ltrs per 100km's. 1997 GQ 2.8td manual Patrol done well I thought.