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Does the SVX have the front vents or did they cease before your model ?
I've just come back from over 7000k through central Australia in my '95 defender and had a Patrol accompany me. The Patrol ended up with dust all through it whereas my defender had virtually none (which really bugged the Patrol driver).
I've done extended tours with Hilux drivers before who also seem to get heaps of dust in.
I just keep some distance from the vehicle in front and keep the front scuttle vents open slightly to keep the cab pressurised. Sure, I can see daylight through door seals but the pressure keeps the dust out.
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After The Prang, the gap under the passenger front door at the front was even bigger. At one stage driving on dusty gravel in the outback I could see a jet of dusty air coming up into the cabin. This wasn't bad because at least you knew where it was coming from. We scrunched up the paper bag that came with a pie and stuffed it in the gap - problem solved.
The only possibly useful thing I can add is don't assume that the dust gathered around the bottom of the doors, especially the rear door on a wagon is dust coming in. My hypothesis is that it is actually dust that has come in to the vehicle and has passed towards the back and is trying to get out again, not in.
