Wednesday, Sep 21, 2005 at 10:26
I'm being lazy on this response so I'll copy/paste from other sites.
Under-loading of the engine will cause a high wear rate due to incomplete fuel combustion, loss of lubrication and slobber, resulting in cylinder
bore glazing and fouling of exhaust ports and valves, along with insurmountable amounts of exhaust pollution. Proper and controlled loading is therefore essential. It increases diesel engine life by up to four times and improves the efficiency by ensuring that the engine has sufficient loading at all times.
"Engine Wear and Tear
Letting an engine idle actually does more damage to the engine than starting and stopping. Running an engine at low speed (idling) causes twice the wear on internal parts compared to driving at regular speeds, which can increase maintenance costs and shorten the life of the engine
Feel free to research it yourself, it's all about oil pressure and compression pressures, boring stuff. Newer trucks don't need warm up time at all, same as all newer cars and 4WD's(many won't believe that), turbo cool down is done for short periods after high engine loads, totally different from start up idle.
I'm sure if you read your cars manual it will have a section saying that no warm up idling is required, in Australian conditions.
And as for charging, most alternators put out bugger all amps at idle, therefore, the engine would be runnning a long time to put in a decent amount of charge. And increasing the revs with no load just causes more damage.
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