Warm-up procedures when starting from a cold start?

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Agreed on the modern oils, it’s the turbo that needs cooling.

 

So to all the ones that say modern engines don’t need a warm-up or a cool down. What do you make of the manufacturing‘s recommending both on new engines?

 

It never ceases to amaze me how some arm chair mechanics overrule the OEM engineers who have spent a lifetime studying operating conditions, making recommendations and putting them in the literature (owners manual)

Things haven't changed much on this topic. Here is a quote from the owners manual of my 1956 Studebaker Champion:

How to warm it up
Proper warm up has much bearing on long engine life and economical operation. High speed or fast getaway before engine reaches normal heat range is not good for the moving parts inside.

 

I don't think anybody is saying that.
''Define '' warm up and cool down, that's where the discussion comes in.
an engine at idle gets 0 fuel mileage

 

The old quadrajets used to have a tab on the side that wouldn't let the back 2 barrels open until completely warmed up to facilitate that. The problem was in the cold weather you couldn't use the 4 barrel.at all.
The tab used to get bent on mine I don't know why. lol

 

In this thread multiple people stated that it’s not required with modern engines. Nor do you have to bump up the idle. My owners manual says otherwise. I intend to follow manufacture instructions. Especially when it is reasonable.

 

I let water get upto 110 or 120'F. Unless it's west Virginia then 140'F.

 

Since no one has actually posted the instructions here is Detroit's from a 2018....

 

Cummins ISX
Idle the engine 3 to 5 minutes before operating with a ~ load. ~ After starting a cold engine. increase the engine speed (rpm) slowly to provide adequate lubrication to the bearings and to allow the oil pressure to stabilize . .,6CAUTION.,6 Do not operate engine at low idle for long periods with engine coolant temperature below the minimum specification in Coolant Recommendations and Specifications (Section V). Low coolant temperature can result in: • Fuel dilution of the lubricating oil • Carbon buildup in the cylinder • Cylinder head valve sticking • Reduced performance.Idle the engine 3 to 5 minutes before operating with a ~ load. ~ After starting a cold engine. increase the engine speed (rpm) slowly to provide adequate lubrication to the bearings and to allow the oil pressure to stabilize . .,6CAUTION.,6

 

Do not idle for extended periods of time. Excessive idle time can cause poor engine performance. Internal combustion engines must not operate at low idle speed for extended periods of time. This operating condition may lead to poor engine performance. The idle shutdown feature, available on most Cummins® engines, can be programmed to shut the engine down after a period of low idle speed operation with no driver activity. A flashing warning lamp will inform the driver of an impending shutdown. If an engine must idle for an extended period of time, it should be done at fast idle (1000 rpm or greater). The Power Take-Off (PTO) feature, available on most Cummins® engines, can be programmed to adjust engine speed with the use of OEM switches to pre-programmed set points.