Do they call the Gearbox oil G13 too? I thought G13 was the coolant.Nice one, i want to do ours soon as its nearly at 140k and doubt its ever been changed! tempted to add an additive maybe?..... can of worms i know! was going to price up the oil from VW with discount as they do good rates with discount, got G13, two bottles so 3 litres for about £13 i think the other day.