Engine oil Mobil or Castrol

I've used Castrol GTX in my E30 for a decade now.

E39 S62 (M5) engine - used both castrol 10W60 and Liqui Moly 10W60.

Mobile 1 all synthetic high mileage is thee only oil I'll put in my car

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.

Use better oil and change every 5k My Audi S6 would go through a quart every 5k That's when I change the oil -- Mobile 1 --extended 15k oil - Ive put 90k miles on it in the past 10 years it still runs strong!

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.

Always used 0w40 Mobil1 every 5k miles and it’s perfect

I just did the chains + headgasket and a bunch of other misc stuff on my Corrado earlier this year. My guides were worn pretty bad and it only had 120k on the clock.