My gas cap on my 96 says 89 octane.
I recall my 98 also said 89 octane.
I don't think it burns any better with 91 octane.
If anything, you are just wasting money. __________________ ...steven
BMW CCA #146825
1996 BMW 328ti • 2003 MINI Cooper S • 2016 M235i
www.bmwcca.org
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