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5W-50 Oil is a Big No No for the S63tu
I can tell you now using that engine weight will guarantee another engine failure . Another OP dicing with his engine because a rebuilder told him its ok !
The maximum oil weight is 40W for very good reasons ! The S63tu engine has been designed internally specifically for a strict (criteria) weight oils . And that’s from Bmw M Engineers in Germany .
Another OP (from Egypt) on here tried 10W-60 and that engine failed (catastrophically) within 500-1000 miles after rebuild.
The best thing you can do with these engines is to change engine oil and filter on a regular basis .
I’m afraid what you’ve been told is well not true ! But don’t take my word and seek out an independent specialist Bmw engine builder .
Cheers
Bruce
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