But the Castrol Syn was good 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.
I use castrol edge advanced full synthetic on mine works fine I change it every 6.5K on my 21 5.0
My oil cap says Castrol only, which is what my husband uses. We change the oil every 5000 miles using Castrol full synthetic.
I used to use Mobile1 in my vehicles but switched to castrol edge only becuase mobile1 didn't have very good flow rates at startup in colder climates (like Michigan) as castrol had. Plus it's recommend for asian vehicles and I drive Nissan and Mazda.
Castrol Edge Extended Performance 0W-20. Haven’t had to change the oil yet but I will around 7500 miles for peace of mind.
After tuning. Castrol edge 5w40 and 6 months or 5k.
Figure the changes are cheap insurance.
I personally used to run mobil 1 0w-40. as you said its super thin and seemed to just barely get the job done. Recently switched to castrol SLX 5w-30 and I am decently pleased with the first two changes.
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