I personally use 5w50 valvoline fully synthetic racing oil for my r56 and change every 5000 km which is like around 3k miles and it's running good
I used Castrol magnatec 5w30 Fully synthetic every 6-7k Miles.
I used Castrol edge 5w40 euro car when I had my car.
I run Castrol Edge in my VDub. It's the European blend that is approved by VW as shown on the back of the jug.
I use Castrol R, smells great and reminds me of riding 2 stroke bikes from my younger days.
Castrol full sinthetic.
Or Motul 7100, even better.
I use Castrol on my z4. Works like a charm
Castro Synth. is all i ever used in my BMW 60,000miles runs perfect change every 7,000 miles
(5w-40)
After some research I heard people use 5w40 to quiet the motor down and lubricate the lifters better for high mileage engines. picked up some castrol edge 5w-40 and it runs buttery smooth, noticeably quieter and another big thing is oil consumption drops A LOT due to the oil being thicker and harder to burn or leak. I used to need maybe a quart a month now Ik down to half a quart a month.
I run 5w40 syntec and I eat about 1/2-3/4 oil every 5,000 miles. It will eat it more if I drive it really hard.
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