Q6 What about heavy loads and marine or stationary engines that run continuously? The recommended use level of Valvemaster was selected to give protection to Australian vehicles susceptible to VSR under moderately severe conditions. It is considered that this level of protection will satisfy the majority of Australian driving conditions. i) For heavy load applications i.e. older vehicles that do a lot of highway motoring or load carrying, additional protection may be needed when using lead replacement petrol (LRP) - see the answer to question 3 ii) For extreme applications i.e. continuous operations at high load and high speed (e.g. marine engines or stationary engines) it is recommended that higher levels of Valvemaster (1 .5 to 2 times recommended) be used to minimise any tendency towards valve seat recession. Seek advice for such uses.