Elite Contributing Member
Car: 2006 Chrysler 300C CRD Touring in Mineral Grey
Join Date: Aug 2006
Location: Surrey, England
Thanked 220 Times in 205 Posts
5W30 has a wider temperature operating range than 10W30 so should be a superior oil, assuming other relevant specifications are met or exceeded. Although my Audi A4 originally specified 10W30, I have been using 5W30 for several years with no problems. Starting is much improved in sub-zero temps. Have you checked your Owners Manual to check for any alternative grades of oil acceptable?