If you start a car and drive away without letting it warm up in winter, your oil will be too thick, so your engine won't be happy, and your tranny fluid will be even thicker, so your tranny really won't be happy. If it's above about -20 5 minutes is plenty to get them warmed up enough, but don't expect heat till you've driven a minute or two after that.
edit: not sure about a manual, maybe you'd be safe on the tranny end, but I doubt it.
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2003 Alero GL2 LA1: pacesetter cat back, Energy Speed WAI, Magnaflow downpipe/cat, tinted tail lights, and polished letters on intake manifold.
1987 Honda Rebel 450
1967 Buick Riviera 430 Wildcat: roadworthy but needs restoration.
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