R18B (04/2021 -). Transmax 75w-90, drain and filler crush washer & o-ring for the following BMW models R18 Transcontinental (04/2021 -). R18 (05/2020 -). R18 Classic (09/2020 -). It's good practice to regularly change the oil in your final drive unit - here is the oil and necessary washers for the job.
