5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
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not really sure what you are asking. newer bmws have timing chains so they dont slip on timing and that only leaves an accessories belt and an AC belt.
for my 2003 520i i changed the main belt of the fan on 65K KM and its easy to chek it, i found alot of cracks on it and it was time to change it, but the AC belt was Ok at the same time
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