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Old 07-11-2012, 07:53 PM   #7
AntonLargiader
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Joined: Aug 2003
Location: Charlottesville, VA
Oddometer: 4,195
Yes, you do. R10 hose will degrade in sunlight and R9 hose will degrade when submersed. Each has its place.

However, even the R10 hose can decay when left in old fuel for a long time. Sometimes it just needs to be replaced even though it was being used correctly.

EDIT: the BMW hose isn't marked R9 or R10. It's NBR-NBR for internal, and CR-NBR (or a variant of that) for external.
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