There is a school of thought that the occassional "run to the red" is actualy beneficial .. providing, as said that the engine is fully warm before hand, and allowed to cool correctly thereafter.
The benefits are "supposed" to include ...
"cleaning" the cylinder head/plugs by increasing the flow rate/temperature. (debateable)
"cleaning" the breather system by increased flow rate. (possible)
"removing" mayo from the oil system by increased temperature. (probable)
"exercising" multirams fully so preventing "sticking" (possible)
"exercising" the oil pressure relief valve so preventing it sticking when actualy required (probable)
"cleaning" the oilways by increased flow/pressure so improving flow at lower rpms (probable)
"cleaning" the waterways in a similar manner as higher rpms cause higher flow from the waterpump (probable)
"cleaning" the cats/exhaust by higher temperatures/flowrates (possible)
"increasing" the feeling of wellbeing of the driver, by causing "fun", thus reducing stress and prolonging life. (certain)
