My service interval is 12months/12500mls on this basis it works out at 37,500 mls/3years which seems about right. Looking at my old Escort manual which quotes 20,000 mls for the HCS and CVH engines however they quote 30,000 mls for the Zetec engine.
I find interesting that we have 2 Zetec 1600 engines for the C-MAX with no explanation
1 (Sigma) 16 v DURATEC TI-VCT 115 BHP with a 160 CO emission
2 (Sigma) 16v DURATEC 100 BHP with 166 CO emission
What I find really interesting is no 1 being in the lower Road Tax Bracket (£145)!
Can't wait to hear any theories????