I use it in my MK4 1.8T. Tuned with 212K miles on original engine and turbo. Still going strong, no complaints.
Therefore, although I have used Mobil1 synthetic oil exclusively in all my vehicles for more than 30 yrs, and even though M1 0W40 is VW 502 approved, it is not the recommended viscosity, so I now use Liqui Moly Leichtlauf high tech 5W40.
But the Castrol Syn was good too.
My Good ol' Beast only gets Liqui Moly 5W-40. Has just 127k miles on it. it runs the best on it and is rev Happy too.
I've used Castrol GTX in my E30 for a decade now.
E39 S62 (M5) engine - used both castrol 10W60 and Liqui Moly 10W60.
Just updating! I used to put Castrol Magnatec 5w40 on that Golf, and the engine just improved from day one. Much smoother and with greater response to throttle, and the engine start got like 2 seconds faster, almost instantaneous.
Leichtlauf every 5k for me with Certech added in every 30k.
i just use liquimoly leichtlauf. really can't go wrong with it.
Liquid Moly Molygen for me
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