I'm running 0w30 German Castrol in my Toro Lawn Mower and it seem to work well. Can I use German Castrol in all my small engines? I have a 7HP or 9HP Honda Pressure Washer, a 3.5HP Briggs and Stratton lawn edger which is pretty old(12 years or so). Can I use it in the brass pumppart of the pressure washer also or doI need the special oil for that? Thanks!