Talk about car (relatively more expensive one), it is good to buy insurance that cover the "betterment" if you intend to keep the car more than 5 years.
Generally, insurance will cover 100% of the repair bill if the vehicle is less than 5 years. Above 5 years, vehicle owner is required to pay about 15%-20% as "betterment" of the total bill if new part/component is used as replacement.
15-20% can be substantial for most continental cars. For example, the HID headlamp (one headlamp only, not one pair) is at least RM5000 for a Swedish brand. 20% "betterment" means RM1000 from own pocket !!
The additional yearly insurance premium that cover "betterment" is around RM200. It is a small amount compares to the parts cost in the event you make insurance claim.