All engine faults/repairs/maintenance Performance/Longevity

Engine air inlet source Hot summer conditions:-

Fortunately, the vehicle's air drag goes down more than the power does in hot ambient conditions, but picking up fresh, cool ambient air is still important, rather than hot engine bay air. The higher its picked up above hot tarmac, the better; there can be a large temperature difference between hot tarmac and air 2 metres above it in summer sunshine, up to 5 degrees C. Engine bay air can be anyone's guess in these conditions, 50, 60 or more? That sucks power and as well as that, means peak combustion temperatures go up and if turbocharged, reduces turbo efficiency giving even more of a temperature rise.

Oil Coolers: Considered very important for longevity of turbo-diesel engined T25's, due to the massive amount of heat generated in these rear-engined vehicles running with hot engine bays. The original fitment oil cooler is really an engine oi/coolant water heat exchanger designed as much to warm the oil up quickly as to subsequently cool it. A separate dedicated oil cooler is recommended , especially for 1.TD diesels.