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I've used Rotella T6 on every turbo car I've had including this one. Seems to hold up well to heat and boost. 5-40... Wrx, Sti, 335 and M235xi...
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2020 X3M /// MHD Tune
Prior Bimmers
2017 240XI Hybrid / FBO / MHD E40
2015 235XI FBO / MHD E30
2009 335XI FBO / COBB / E30
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