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Originally Posted by
blower
It could be piston rings, but I have seen plenty of other causes for high oil consumption on this engine.
More likely causes are either oil leaking past the turbo seals, or a leaking valve stem seal.
The turbo seal leakage is common if you have upgraded the exhaust, a catback may not be enough to cause it but a turbo back/decat/sports cat commonly causes oil seepage past the turbo seals. The cause for this is when you upgrade the exhaust you reduce exhaust back pressure - this puts the turbo internal pressure out of balance, with the already high oil pressure that's run on the turbo resulting in oil pushing past the seals, sometimes damaging them in the process. The solution to this is to use a more restrictive banjo bolt on the oil feed line to the turbo, to reduce internal oil pressure.
Valve stem seals have also been known to leak, a separate problem that has no particular cause other than a dodgy seal or wrong oil/missed oil changes.
With the timing chain, it's best to get the new kit that VW do - part no. 03C198229C
The kit is a hell of a lot cheaper than buying the parts separately.
With that you get a new camshaft adjuster, timing chain, chain tensioner, guide rails, camshaft sprocket and crankshaft sprocket. The camshaft adjuster on early 1.4 TSI engines is known to stick and make a loud grinding noise on cold starts. The new one that's in the kit has been redesigned to stop this.
The water pump has no specific change interval. Since the water pump on the 118KW twincharger is also the supercharger clutch (they are integrated into one unit), it is likely the clutch will begin to fail before the pump. The pumps are not known to fail prematurely, they are pretty robust on this engine. Plus unlike many belt engines there is no need to replace it at the same time as doing the chain - as not much work is needed to get to it, unlike getting to the chain.
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