Servicing and maintaining the 3 Litre is not difficult and on reading through the instructions that follow it can be seen that it will not take very long to ensure that the car is always regularly serviced. The chassis should be lubricated once every 2,500 miles, unless it can be seen that lack of oil or grease on a certain item or component is causing very rapid wear. The accompanying oil diagram shows all the points that the oil gun should be applied to once every 2,500 miles. Engine oil should be used for this purpose.

There are several special points that should be noted with regard to lubrication of the chassis and these are as follows. The rear axle has on either side oil nipples for lubricating the brakes camshafts. It is important that these are oiled sparingly as the oilways are connected with the rear axle casing, and too much oil will cause the level in the rear axle to rise, which is undesirable because it may get onto the rear brake shoes.

The oilway is purposely constructed like this as otherwise the pressure from the oil gun would immediately force the oil into the brake drums. An oil nipple is also fitted on the clutch shaft, which should only be lubricated sparingly, as any surplus immediately leaks out, and splashes over the undershield when the engine is started up. The other parts on the chassis fitted with oil nipples should be lubricated till the oil shows in the joints. It is a good idea to warm the oil before it is placed in the can as it will penetrate to all parts of the joint that should be lubricated. Other moving parts not suited for oiling with the gun, such as the brake rod pins, the carburetter and magneto controls and the clutch thrust rollers can be lubricated with engine oil from an ordinary oil can. On later models the dynamo spindle is lubricated at both ends by a greaser. One can be found on the front of the dashboard, and one at the rear end of the dynamo under the scuttle.

The oil level in the sump is topped up through the filler on the nearside of the crankcase. The oil level is measured by a gauge that protrudes from the flange of the sump immediately below the oil filter. The gauge is off the float and rod type and when the top of the rod is level with the upper mark then the tank is full. When the level is at the lower mark this is the danger point, and the oil content must not be allowed to drop any further. The amount of oil that is necessary to raise the level from the lower to the higher mark is in 1 1/2 gallons. The total capacity of the sump when full is 2 1/2 gallons. When the tank is being filled ample time should be allowed to let the oil drain through the gauze filters.

If the sump is overfilled excessive oil consumption will be the result. The oil pump is of the gear wheel type, and is driven by a spindle rotated by worm gearing off the forward end of the crankshaft. After the oil has left the sump it passes through a cylindrical gauze filter, which requires cleaning about once every 10,000 miles. After leaving the filter the oil is fed via branching pipes to the five main bearings, and the hollow camshaft. An oil with a viscosity 40/50 S.A.E. should be used for both summer and winter. The engine oil should be changed every 5,000 miles, after it has become thoroughly hot. The front of the car should be jacked up, and one or both of the drain plugs situated at the back of the sump and on either side of it can then be removed. The greaser which lubricated the water pump spindle should be kept full and turned down regularly.

Also every 2,500 miles the level of the oil in the gearbox must be inspected. this can be done by removing the cover. The level of the oil should be up to the centre of the lowershaft. Three quarts are required to fill the gearbox to the desired level from empty. It is important that the gearbox is not overfilled.

The oil level in the back axle should be examined every 2,500 miles by removing the filter cap, which can be found in the rear cover of the differential casing. The level in the axle should be about three quarters of an inch below the top of the filler. It is of vital importance that the level should not be above this, as if it is the rear brakes may get get oil on them, which will ruin their ability to retard the car. Two pints of oil are required to fill the rear axle from empty. Similar oil to that used for the gearbox should be used. i.e. Golden Shell or an oil of similar viscosity.