The Tech Talk guy suggests every 30k miles. That's what I did on my E46 M3.
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Current: '18 AW Performance Edition m240i
Gone: '15 Mineral Grey m235i || '07 Silver Grey M Coupe || '11 Space Grey 328i XDrive || '08 SparkG M3 || '01 LSB M3 || '01 TiAg 330ci
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