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Oil is cheap, motors are not. Better oils last longer... Crappier oils could last decent on street driving, but with heavy use it'll break down quite quickly.
I personally will be running Motul 5W-40 during track season, and flush with 0W-30 BMW whenever its due.
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BM3, MHD, ECUTek Calibrator | N55/S58 specialist | 2023 X5 45e Frozen Marina Bay Blue
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