peak is the wrong color fluid as it should be blue BMW fluid also check your codes even if with a generic obd2 code reader because you might have a p1552 or p 1553 for intake or outake vanos solenoid malfunction as it wont always throw a SES but it will store it. You already cleaned which is good but try also changing your oil and re cleaning solenoids and recheck tire pressures and reset trip computer to recalculate gas
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