Does my car need an oil flush when it is serviced?

My 2018 Suzuki S-Cross is due for an MoT and service. I have been quoted an additional £50 for an oil flush. At 35,000 miles is this essential or worth it? I’ve been driving for 60 years and am not familiar with this procedure.
Given modern engines use synthetic oils and sticking with the servicing schedule, we would not consider an oil flush as needed.
Answered by Alan Ross on

Ask Honest John