Owners agree the engines themselves are stout but the plastic around them is not. On the 1.8T, the factory water pump's plastic impeller is a known early failure, and the fix cited in-thread is an all-metal pump that costs only slightly more; the 1.8T also sludges when oil changes are stretched, so owners run short synthetic intervals with the larger filter. …
Cooling system plastics and 1.8T oil care decide engine longevity
Volkswagen GTI (Mk4) · mechanical