Originally Posted By: mva
Here is a thread from 2011 on this topic:
"Why does BMW require 10W60?"
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2456256&page=1
BMW requires TWS because they work with castrol in developing an oil that provides both Clean Lubrication & can stand up to Track/High Speed conditions
M cars in germany are meant to commute to work @155mph and hit the track on the weekend - tws provides protection in both situations - outside of the germany and europe speed limits are much lower and few can get away with 100+mph commutes so a 60weight is required as many keep pointing out
TWS is not the only oil that provides outstanding lubrication - plenty of other oils have more additives to improve their lubrication properties, but they will likely leave deposits if run on extended intervals close to BMWs recommendation
so really if you want 15,000 mile oci tws will beat any other 60 weight when it comes time to measuring any build up/deposits that may have been left (check bottom of oil filter housing)
but there are many oils that provide excellent lubrication - this was never and will never be different. since everyone spends $100 on oil and dumps it @5000miles whether its TWS or M1 or Liqui Moly - you won't have deposits and the engine will never know the difference
i've used bmw 5w30, m1 0w40, m1 5w50, and tws my car never just stopped and threw up an error message saying:
"warning no castrol tws in engine not enough lubrication to continue"
Originally Posted By: turbokick
I can't find an oil that do the job (I don't know if there is such an oil) - to be good for street everyday driving and to be able to resist on the track. Last two oils were great for the summer days but both of them lasted 5 minutes on the track (and the lifters began to hear).
if there's nothing wrong with your lifters then it's likely the oil pick up points since bmw doesnt build 3-series factory deift cars your oil system cant keep up with the g-loads and what you hear might be oil starvation - if so a 60 weight probably won't make a difference - you might want to look into accusump systems to correct this.