Over time it has been shown that the 1.8T engine (especially when he was driven in Longlife interval times) has problems with the formation of sludge, the first settles only on all surfaces. But as soon as a corresponding layer is present, it may come off and clog tiny oil drilling and the sieve of the oil pump. Following are a rattling, clattering chain tensioner, tackernde hydraulic tappets and a poor smoothness.
In addition, the engine (like all turbo gasoline) tends to coking in the oil supply line of the turbocharger. In the long term is a defective turbo result (when it comes to the realm of lack of lubrication).
That is the theory.
When I bought my Passat (123.000KM - Maintenance Guide) this also something rattled and the hydraulic tappets have easily rattled. In addition, the engine was running pretty "hard". Sound almost like a diesel. The Turbo went fortunately good (neither radial nor axial play of the turboshaft).
As I did with the Castrol 10W60 good experiences in my previous car (and also know someone who has a Mercedes now has 500,000 KM !! travels with this oil), I again resorted to this. And although in the relevant trade forums a Mobil1 has formed fanbase that advises Mobil1 5W50.
After switching to the fully synthetic 10W60 I did an oil change at a distance of 2,000km 3x and additionally between oil changes even 3x the oil filter (plus 1L fresh oil). To hinauszuspülen the oil sludge. (One Engine flushing I have not been wall! This seemed to me dangerous.)
For each oil change, a pitch-black sauce from the engine came (a sign that this oil is high, because it binds the dirt in the engine and also promoted at the next change).
And what should I say? Meanwhile (KM 127,000), the engine purrs like a kitten silky smooth. From the initial rattling the chain tensioner and the rattling of the lash adjuster is almost nothing left to hear! I'm excited!
