Hi, GRC. I hope you don't mind me chiming-in here. My C43 has the MB Starmark Component Coverage. It specifically lists the timing chain cover and HB as being covered.

My previous G35 used CNA National Warranty Corp.'s T2 Automotive Preferred Care package. It covered the entire engine and ancillaries except for specific exclusions. The timing chain cover and HB are not listed as exclusions.

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Dan
1998 C43