You probably don't \"need\" syn, but its a darn good idea, esp if you want to run 5000k ocis with urban driving and/or want to keep the car for a long time. If you do stick, with conventional, which i don't recommend, make sure its better stuff like Castrol GTX.
I run either 0w40 castrol full syn or 0w40 pentosyn in all my cars. After changing oil every 1000miles for 5oil changes and ever 3k after that my old corolla looked like a brand new engine inside with 125k on it when I pulled the valve cover to do a t-belt.
I run Castrol's Syntec 5W 50 in my TD... it's CD and CF rated so fine for IDI TDs like yours... great in the extreme cold but thick enough for the summer.
My VW dealer uses Castrol Syntec 5W-40 that meets the VW 502 standard.
I use castrol
For some odd reason it seems that mobil 1 iron numbers are a bit higher in the 1.8T. I switched to Castrol Syntec 0w-30 and my iron numbers went down.
castrol 5w40 is what vw puts in the new passat. just did my 5k oil change the other day. i used a original vw oil filter also.
I've been running Redline or Royal Purple 40wt
All oil changes on this car have been done with Castrol Syntec 10W30 Full Synthetic and an OEM Mazda Filter.
From what I can find, Castrol makes a 0W30 longlife oil which can be used in VW engines which have sensors which support the longlife service regime. According to this regime, oil change intervals can range from 9,000 miles or 12 months to as long as 30,000 miles or 24 months - IF the sensors will allow such an extended interval.
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