Duly noted Peter.

But if emmisions are the concern, then why drive off in 10 seconds (stated in OM), when the car is by no means at operateing temps in 10 seconds....and keep in mind, this is for any temp abover freezing.

 

What if they don't have anything to do with engine warmup at all. Its quite likely that those instructions are for some other issue that takes place when the engine is first started. Like the ABS system pressurizing. This normally take about 5 to 8 seconds after the motor starts. They would be unwise to suggest the car can be safely used until the Abs has self-checked.

Concerning the trans wear issue, I can't find an online resource to verify my quote of 400percent. It is a very old number and incase you are not familar is based on the design of the planetary gears that auto trans use. There are internal parts that are rotating around a sun gear that do not rotate in 1to1 mode. Quite a lot of rotating mass is added when this is taking place.

Trans replacement at 60K miles was probably an oversimplification but the net effect is the same.. much increased wear.

 

I will concede that fact, yes, but the fact that there is a statement that says 'when below freezing, let it warm up' says to me that there is an issue of relationship between letting the car warm up,
and wear and tear on the car, not emissions.

Going back to another earlier statement of yours, if you start the car up at 30* and let it warm for 4 minutes, why? Because you care about emissions? Come on

If emissions are an issue at 30*, then why not at 40*?

Do you see the connection I'm making?

In the end, I baby drive the car until the temp mark is at least to the first mark. I do it because, well, it seem like common sense to not drive a car hard when its cold; engie, trans, susp, and tires.

Emissions or wear and tear - choose either one you like.

 

Seems to me it's time for our petroleum engineer members to chime in.........

 

You rang?.....Sounds like a bunch of hot air to me...

 

mt: yeah, or a lead tech like DevilDog maybe

eng: yeah, most definitely - I'm guilty...

 

I don't know what theirs was. I imagine the emission regs had a lot to do with it.

edit 7:11cdt i should say that i might have caused some of this thread to get mistracked (or I misinterpreted it). From the time i first chimed in, I was talking about the late shifting until partially warm. Not really the use of eshift. I agree that the use of eshift until partially warm has nothing to do with emission and only an effort to reduce wear. I also am just as confident that the late shifting until partial warmup is just as focused on emission as the e-shift prevention is focused on wear.

end edit

Mine is purely based on the late shifting. Even when it's 58degrees outside, if it would cause the motor/trans to shift late, I give it a minute or two longer. Its as simple as that. Even after the temp gets to the first mark, i accellerate at the minimum rate. I never gas my car more than about 1/2 throttle until it is fully warmed up.


Now, i guess I am ****-retentive/obsessive-complusive but thats just the way I have aways done it.

 

Hey, I can identify with your comments. OCD ain't THAT bad to live with.



I think you and I agree upon 'warming up', we just differ in our opinions as to why we think we need to.

 

Hi,

I let my es300 warm up for 3 minutes and then i baby drive the car at its idle in overdrive and let it go on its own for about 5 minutes until the temp gauge registers half way and then i go a little faster and drive normally, If your engine and tranny are not properly warmed up and the fluids arent moving as fast and lubricating proper parts you are going to get some cold start wear, it is only natural. The RPM on my motor is real high when i first crank it up in 30degree weather and then the RPM's start to slowly drop as the engine warms up to about 1500 rpm from at 2000 rpm at first start.

 

My guess is that big brother is trying to reduce the occasion of high rpms until the engine is warmed up. Knowing that the engine rpms will be higher in a lower gear (at any given speed) someone decided that until the engine is warmed and lubricating properly they’d protect those of us that E-Shift from excessive wear in some small way. Note that it doesn’t prevent some nutcase from over-revving the engine in neutral while cold or manually shifting to 1st and hauling butt while still cold - over-revving that way, etc. My opinion is that it’s more related to lubrication than emissions.

 

Garnet,

It is a 100% related to Lubrication of the engine.