Millers Diesel additives are good, esp Power Sport 4 which you can use in cars with FAPs. Performance gains are impressive with a std dose adding four cetane numbers to pump diesel.
I also rate forte's Diesel and Petrol fuel treatments. Both good for an intensive cleanup.
Having said that, if you avoid supermarket fuel then your engine should not require extensive cleaning additives unless you're a low mileage 'engine always cold' type of driver.
Cold starts are fine if you proceed to the drive a fair distance. Switching off a lukesarm engine leaves acidic gases and moisture inside. This does untold damage over time. This is thought to be more accountable for cold engine wear than the cold start itself.
Clearly, if you fire her up and then rev the nuts off it immediately you're asking for trouble. |