The general daily maintenance regime for a bus or coach, involves checking the levels of various liquids, including diesel, water and of course oil. All bus and coach engines are fitted with a not particularly accurate dip stick, usually indicating nothing more than a minimum and a maximum oil level. With most maintenance staff, when they check the oil level, if it is significantly below the maximum level, to be on the safe side they will top it up, in the mistaken belief that this is what the engine needs. This, it turns out, is often an inefficient waste of oil.
As well as a maximum and minimum level, every engine also has an ‘optimum’ oil level. This is the level which the engine settles at in normal use, and is often five or six litres below maximum capacity. …Read More