[Howard]

As for head gear damage, it is a real problem. However, it is one that is not to hard to overcome. Most Aussies I'm sure will be familiar with 'Flashlube' which is an upper cylinder lubricant added to the petrol tank of pre-unleaded vehicles. Flashlube make a dispenser kit that will add around 500ml per 5000km into the intake system & help protect the headgear. We fit this on every vehicle except Falcons. I am sure there would be something equivalent available elsewhere in the world...
Some vehicles (eg Toyota Workmate Hilux 2wd, or the new Holden Rodeo) will always destroy their headgear, due to very soft metal headgear.