FOURS AND SIXES
Engines last 200,000 miles between rebuilds and parts are generally plentiful because some Land Rovers share some P4 units. All engines need fresh oil and a new filter every 2000 miles to avoid premature camshaft wear. A good P4 engine should be almost silent; clattering means that the valve clearances are out, probably because the camshaft is tired. All P4 engines have an alloy cylinder head with valve seat inserts, so they don’t need additives in order to use unleaded fuel. In fact, regular additive use clogs up the SU carburettors, resulting in an erratic mixture and poor running.