Can the experts please give advice about using a flushing agent before an oil change?? I have read various comments about not using any on modern engines because the modern semi- synthetic oils are very good at cleaning anyway. I have been using Castrol GTX Magnatec and will replace with Mobil 1 (only because i have 5 litres) NO, NO, its not my MGF, its on the Honda, its a 2.0 litre VTEC engine which has covered 85,000 miles.
Apparently the Wynn's treatment states "that it should not be used on engines having covered more than 75k"