My recently acquired MK III 16v has burnt it's way through over 1.5 L of engine oil in less than 1K miles. The dealer is using the usual VW quote of 1L per 1000 KM. However , i'm not convinced that all is well and true. On start up from cold there is a blast of blue smoke - which clears. The compression test shows 11 bar in each cylinder - everything ok there. On inspecting the plugs - 1,2,3 are fine. However No' 4 is taking oil like an Iraqi dictator. All this points me in the direction of guides/ stem seals, but it seems odd to me that it's just the one cylinder that has the problem. It's not the plug - changed it, nor the lead - swapped it. Any advice would be appreciated. Thanks.