Also since you intend to race, do consider a full synthetic ATF for your tranny and synthetic gear oil like 75W-140 for your diffs. Mobil-I work fantastic to my knowledge and also Chevron Delo gear oil works even better for MB trannies. Don't worry about the wear of soft metals, Chevron Delo gear oils are EP etching sulphur free and use far better boron instead which protects the tranny well under severe racing conditions.

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99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT