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Am I playing with fire?

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Old Dec 11th, 2022, 23:15   #101
stevebg
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Originally Posted by al dm View Post
:-) I also did my final one yesterday - and just did the level set this morning.

I used the Car Scanner app to see when the ATF temp got to 50C, then crawled underneath the car with it sat on the drive.

It's pretty damn tight to get under there when the car isn't on ramps, but I managed it with a bit of squirming around.

Opened the level plug, with the engine running and very little fluid came out. Maybe 100ml or so. So I am quite pleased with that, it means I was very accurate with replacing exactly what came out.

Shroud back on and we are finally done with the ATF refresh.

I ended up doing 5 cycles with approx 3.5 litres each - so around 17.5 litres of fresh fluid in total. The fluid is much nicer looking and smelling now. It even has a tinge of red to it.

I might add one cycle of drain/replace from the top of the engine every time I service the car, which wont be until the spring now.

Happy Days!
Is it possible to do this from the top ( fill plug ) on a 2009 ?
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Old Dec 11th, 2022, 23:19   #102
al dm
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Is it possible to do this from the top ( fill plug ) on a 2009 ?
It should be. I have a 2011 and a 2013, so can't say for sure. But if you can access the fill plug and you have a vacuum drainer thingy (about £30), then there should be no problem at all.

Pull the airbox off and have a look. If you can access the fill plug, then you are good to go.

Of course, you do need to use the level plug underneath to set the final level, but that should be a "one and done" thing and if you make sure to replace exactly the amount of fluid that you take out, then you may not really need to do that.
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Old Dec 12th, 2022, 03:18   #103
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Do you know in what way or how start stop effects it just purely out of interest? I turn start stop off can’t stand it. I can’t see it having any benefit to the mechanical Health of the car at all.
Just for curiosity's sake. The transmission for cars with stop/start have a oil pump to maintain the correct hydraulic pressure to keep the first gear in standby mode ready to pressurise the clutches at start up. Similarly Twin Engine variants have a pump to provide lubrication when in electric drive with the engine stopped.
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Old Dec 12th, 2022, 03:54   #104
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Just for curiosity's sake. The transmission for cars with stop/start have a oil pump to maintain the correct hydraulic pressure to keep the first gear in standby mode ready to pressurise the clutches at start up. Similarly Twin Engine variants have a pump to provide lubrication when in electric drive with the engine stopped.
With plain bearings such as the crank journals or big ends, it's not oil pressure per se that prevents metal on metal contact, the relative movement of the surfaces builds up a hydrodynamic wedge of fluid - once that wedge is built, in theory, you could replace the engine oil with water and have no loss of "lubrication" (until it boils!) - the oil pump simply has to provide enough fluid to cover losses from the oil (or water!) being flung out the bearing. I've absolutely no doubt that stop start reduces engine life - whether that's enough to reduce it to less than the life of the rest of the car is open to debate. Obviously startup is where the oil earns its stripes.
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Old Dec 12th, 2022, 05:02   #105
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You can have AWD with TF-80SC as well.
The correct answer is that TF-80SD is adapted for start/stop function.
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Do you know in what way or how start stop effects it just purely out of interest? I turn start stop off can’t stand it. I can’t see it having any benefit to the mechanical Health of the car at all.
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With plain bearings such as the crank journals or big ends, it's not oil pressure per se that prevents metal on metal contact, the relative movement of the surfaces builds up a hydrodynamic wedge of fluid - once that wedge is built, in theory, you could replace the engine oil with water and have no loss of "lubrication" (until it boils!) - the oil pump simply has to provide enough fluid to cover losses from the oil (or water!) being flung out the bearing. I've absolutely no doubt that stop start reduces engine life - whether that's enough to reduce it to less than the life of the rest of the car is open to debate. Obviously startup is where the oil earns its stripes.
Hmmm. I was posting about the difference in the AW Transmission designations, quotes above for context.
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