I'd spend a little more that the bottom of the barrel (so to speak). As mentioned, you will use it more often than you think. Any sort of holiday we take more than a week, I use the trickle component of it on the M.
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Grey Matter:2008 E92 M3:608/425. SG/PS SOLD!
Dark Matter:2015 F80 M3:495/505. SOLD!
Anti Matter :2016 F82 M4 GTS
What next?!? A 2022 M235i GC- I must be getting old
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