The mechanical LSD will help in any case where one rear wheel has more grip than the other. However, you're not too bad off without it, because the stability control (VDC) has a brake LSD, which uses the individual wheel brakes to the same end. If you don't mind bleeding off some speed when the VDC kicks in, then you won't miss the mechanical LSD much.
In snow, your best bet is snow tires. In all other bad weather (by which I mean wet), your car should do fine without the m. LSD.
2003.5 Sedan 6MT | Sport/Aero/Premium | Desert Platinum/Willow | 350Z intake |
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