I have taken the following information from my GT6 Mk2 Owner's Handbook

Lubricants

When carrying out the following maintenance work, use high-grade lubricants only. In countries where these oils are unobtainable, use similar oils having the same characteristics. Please refer to the lubricants table at the end of the page.

Engine

When a new car is delivered the engine sump contains a quantity of special running in oil, sufficient for the running in period. Provided that the level does not fall below the low mark on the dipstick, topping – up is unnecessary. If replenishment is required, top – up with one of the recommended engine oils.

At the " Free Service", or after completing the first 1000 miles (1,600 Km.), drain the running–in oil from the oil sump and replenishment with new oil, of the appropriate grade, to the high mark on the dipstick.

Transmission, Overdrive and Rear Axle

Rear axles, transmission and overdrive units fitted to new cars are filled with special oil, formulated to give all necessary protection to gears. This oil should not be drained but may be topped up with any of the approved oils.

Braking System

In addition to adjustment and examination/renewal of shoes and pads at the intervals recommended on the following pages, it is strongly recommended that the brake system is overhauled and the brake fluid renewed every 36,000 miles (60,000 Km) or 3 years (whichever is sooner). This involves dismantling, examining and renewing all seals and defective items.

Preventive Maintenance

At the completion of 1000 miles

Engine

Coolant - check level
Oil Sump - Drain and Refill
Accelerator control linkage and pedal fulcrum - Oil and adjust idling speed
Mounting Bolts - check tightness
Cylinder head - check tightness
Manifold - check tightness
Valves - adjust rocker clearances
Fan belt - adjust tension
Oil Filter - check for oil leaks
Fuel Pump - clean sediment chamber
Distributor - lubricate and adjust points

Clutch and Controls

Master cylinder - check level and top up
Hydraulic pipes - check for leakage

Transmission

Gearbox, Overdrive - check level and top up
Rear Axle - check level and top up
Universal Joint coupling bolts - check tightness

Steering and Suspension

Front Wheel Alignment - check with aid of tracking equipment
Rear Wheel Alignment - check by condition of tyre
Steering Unit Attachments and U-bolts - check for tightness
Lower Steering Swivels - Oil

Brake and controls

Handbrake cable and linkage - lubricate
Hydraulic pipes - check for leaking, chafing and for hose clearance
Master cylinder - check level and top up
Brake shoes and handbrake cable - adjust as necessary

Electrical Equipment

Battery - Check and adjust electrolyte level. Check charging rate
Alternator and starter motor - check fixing bolts for tightness
Headlights - check alignment and adjust if required
Lights, heater, windscreen washer, wiper and warning equipment - check operation

Wheels

Wheel nuts or wire extension nuts - check tightness
Tyres - check and adjust pressures

Body

Door strikers, Locks and Hinges - Oil and check operation
Body mounting bolts - check tightness
Door Handles, controls and Windscreen - wipe clean
Screen Washer - top up

Road Test

Every 6000 miles

Engine

Oil Sump - Drain and Refill
Air Filter - Remove and clean elements
Fuel Pump - clean sediment chamber
Valve seat Attention - Compression test each cylinder
Spark Plugs - Clean and reset gap
Distributor - lubricate and adjust points
Ignition timing - Check and adjust as necessary
Carburettor Dampers - Check and top up as required
Carburettor Balance - Check and adjust as necessary
Accelerator control linkage and pedal fulcrum - Oil and adjust idling speed
Coolant - check level

Transmission

Gearbox, Overdrive - check level and top up
Rear Axle - check level and top up

Steering and Suspension

Lower Steering Swivels - Oil

Brake and controls

Rear Brakes - Check and adjust as necessary

Electrical Equipment

Battery - Check and adjust electrolyte level. Check charging rate
Headlights - check alignment and adjust if required
Lights, heater, windscreen washer, wiper and warning equipment - check operation

Wheels

Wheel nuts or wire extension nuts - check tightness
Tyres - check and adjust pressures

Body

Door strikers, Locks and Hinges - Oil and check operation
Door Handles, controls and Windscreen - wipe clean
Screen Washer - top up

Road Test

Every 12,000 miles

As 6000 mile service plus the following:

Engine

Air Filters - change
Crankcase Breather - Clean
Oil Filter - change
Valves - adjust rocker clearances
Spark Plugs - renew
Water Pump - Remove plug, fit grease nipple and fill with grease
Fan belt - adjust tension

Steering and Suspension

Steering Unit - Remove plug, fit grease nipple and apply 5 pumps of grease
Front Hubs - Check and adjust as necessary

Brake and controls

Front Brakes - Check and replace pads as necessary
Rear Brakes - Check and replace shoes as necessary
Handbrake cables - Adjust as necessary and grease cable guides

Recommended Lubricants