When I take my car in for servicing, they are quite insistent that it is necessary to flush the engine with flushing oil (cost £30) before refilling. However, if I use... Honda are offering a 'premium ...

When I take my car in for servicing, they are quite insistent that it is necessary to flush the engine with flushing oil (cost £30) before refilling. However, if I use... Honda are offering a 'premium ...