I wouldn't run Xw-50 unless I was tracking the car. No way the oil is getting hot on daily driving to need something that viscous.
0w-40 is as high as I would go for daily.
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'07 Yamaha R1 (sold)
'06 C55 AMG (sold)
‘20 M5, MP Carbon Pro Spoiler, MP Carbon Diffuser, MP Black grille and gills, RKP Carbon Mirrors
'14 X5 50i, (wife’s now)
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