First sell what you hate -- the Z4. Then look at the cash as just that ($).
Since your box is still new to you, enjoy the experience and see if that is actually enough car for your needs. If so, invest the Z4 cash and continue with your life as if you hadn't won anything. If few years later you feel like upgrading, use the cash for that purpose, or use it for anything that may come up in the future. Having some $ powder dry (i.e. liquidity) is often underrated. It's a cheap option that allows you to shoot whenever and opportunity arrives in the future, and protects you from unforseen trouble down the road (including Box repair) -- hence it has value.
Z.
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