Motor Road Transport For Commercial Purposes
(Liquid Fuel, Steam, Electricity)

FUEL, SPARE PARTS, ETC. 155 of the engine, the lubrication system, and the season of the year. A considerable difference in the yearly charges for lubricating oil and engine repairs will result according to whether or not a right choice has been made. Economy in Oil. Oil, like most other things, has risen in price lately, and it is more than ever necesary to reduce the con- sumption per vehicle mile as much as is consistent with efficiency. Over lubrication is a costly habit, but one which is often indulged in. Extravagant in oil, it impairs the mixture, and tends to carbon the cylinder heads, pis tons, plugs, and valves. The modern type of engine is generally provided with some means—-whether it be an overflow tap or a tell-tale— of obviating this evil, but the man who filis up often thinks he knows better than. the designer. The oil should, without exception, be carefully strained before being poured into the engine, and just the right amount, and no more, put in. In connection with the gear-box, and—where chain drive is not employed—the differential case, the same rule as regards quantity applies. It is seldom that the bearings, except when newly fitted, are absolutely oil-tight, and if the box contains an excess, the lubricant will only work out, make a mess in the undershield, and be lost for any useful purpose. Moreover, where a casing is filled, or nearly so, with a heavy type of lubricant, power is absorbed unnecessarily when the wheels are in motion. Value of Proper Drainage. An important consideration—which sounds in oppo- sition to economy, but in reality is not so—is that of