what brand/type of oil do you m50 guys with high mileage use?

yes, I know I read the FAQ but I want to know a good BRAND

and of course, synthetic is needed.

I use valvoline 20w50 without issues year round.

I use mobil1 15w50

I use mobil1 15w50

+1

a friend reccomended castrol synthetic 10w40

will that work?

any problems using that weight/ viscosity?

a friend reccomended castrol synthetic 10w40

will that work?

any problems using that weight/ viscosity?

I'm currently using that... no problems at all.

I've also used Mobil 1... can't tell the difference, then again I only leave the oil in for 5000 miles.

I like using Lucas, or another brand of oil additives on high mileage motors.

for oil i use lubramoly on my m52, mobil 1 is ok, definatly nothing wrong with it, but lubra/liquamoly/elf/amsoil are better.

I use Castrol GTX High Mileage 10w30

I started using castrol magnetec 10w40 today engine sounds much smoother than with the old liqui moly I change oil at least every 3000 maybe more often if iv got some spare time.

I'm usin 10w30 castrol synthetic in mine with i have some high miles and ive got no probs

I'm running the mineral oil from the dealership which is 15w40 weight (Castrol brand) every ~5000 miles with zero problems. 184k on my clock and it still runs great with no leaks.