I've always used straight up techron. Been using this for years ever since I discovered Audi service used it for their scheduled maintenance. I don't know if they still are. Perhaps they now have their own labeled cleaner like BMW does.
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'07 Z4MR '22 GT4 '18 GT3 '16 GT4, '16 M2, '14 X1, '13 135is, '06 330i, '03 323 Ci, '01 330i, '99 M3 (RIP), '96 318is, some non-BMWs
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