I recommend you purchase as much insurance as you can afford. Use our car insurance Coverage Calculator to determine the limits for your situation. In MI we offer these limits for Bodily Injury Liability (BI) and Property Damage Liability (PD):
BI - $20,000/$40,000
BI - $25,000/$50,000
BI - $50,000/$100,000
BI - $100,000/$300,000
BI - $250,000/$500,000
PD - $10,000
PD - $25,000
PD - $50,000
PD - $100,000

Your company may set guidelines for the required amount of coverage when using your vehicle for business purposes. Make sure you select Business Use on your policy and not personal use!

While you are looking for insurance quotes, you can get a quote at CarInsurance.com for Michigan auto insurance. Starting in November 2007, we offer Progressive Drive Insurance in Michigan.