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  #16  
Old 09-06-2010, 05:01 PM
compress ignite's Avatar
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Motor Oil = LUBRICATION
ATF= Not Lubrication (When compared to Motor Oil)
How many miles have you shortened your engines lifespan,just to have sparkly
engine innards ?
(That you'll probably never see...Until you've got to replace those spun bearings)

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  #17  
Old 09-06-2010, 05:34 PM
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Quote:
Originally Posted by compress ignite View Post
Motor Oil = LUBRICATION
ATF= Not Lubrication (When compared to Motor Oil)
How many miles have you shortened your engines lifespan,just to have sparkly
engine innards ?
(That you'll probably never see...Until you've got to replace those spun bearings)
Fail...

I haven't shortened my engine's lifespan, I've extended it.

I'm no stranger to tribology, and this isn't my idea, it is a very, very old idea, and I have never yet seen the slightest sign (either in oil analysis or component inspection) that it is in any way bad for an engine, and plenty evidence that it is good for an engine.
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  #18  
Old 09-06-2010, 09:34 PM
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Quote:
Originally Posted by W124 E300D View Post
I ALWAYS bang a litre of cheap ATF into the engine oil 250 miles before I do an oil change.

ATF is full of detergents, keeps the inside of the engine lovely, and cleans out lifters etc.

You can also put a litre of ATF in a diesel tank now and again to clean the injectors... on a diesel when I do a fuel filter change I prime the filter with neat ATF.

My oil is still clean 1,000 miles after an oil change, not manky 10 miles after.
heh. atf is also full of friction material to grip the hydraulic discs and bands... in the way back past, the old school aft was indeed a decent detergent additive, however, it's just not the case anymore. waay more detergents in quality diesel rated oil, especially the synthetic stuff. hard on fuel injectors, hard on bearings. I doubt it'll do anything in the quantity of fuel mixture in a 20 gallon tank, but in an 8 quart pan, a quart of atf can indeed shorten the lifespan of bearings, injection pump, camshaft etc... if you are using quality diesel rated oil to hold soot in suspension, and you are changing the filter and oil at recommended intervals, you'll be happier with the lifespan of your engine.
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  #19  
Old 09-07-2010, 08:20 AM
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Originally Posted by vstech View Post
heh. atf is also full of friction material to grip the hydraulic discs and bands... in the way back past, the old school aft was indeed a decent detergent additive, however, it's just not the case anymore. waay more detergents in quality diesel rated oil, especially the synthetic stuff. hard on fuel injectors, hard on bearings. I doubt it'll do anything in the quantity of fuel mixture in a 20 gallon tank, but in an 8 quart pan, a quart of atf can indeed shorten the lifespan of bearings, injection pump, camshaft etc... if you are using quality diesel rated oil to hold soot in suspension, and you are changing the filter and oil at recommended intervals, you'll be happier with the lifespan of your engine.
Please note, I said "cheap ATF".

Perhaps I should have said Dexron II / III ATF.

Dexron IV / V / VI do indeed have friction modifiers and / or synthetic bases, but they are actually MORE lubricating in certain circumstances (think EP ratings) than Dexron II / III which is why some moders auto transmissions spec Dexron V minimum.

Nota Bene, "Friction modifier" != (does not equal) "Friction material"

Put ATF in a manual box and you'll get the synchro clutches failing to operate because the ATF is OVER LUBRICATING them.

Dexron III specification constituents (percentage by mass)

93% - severely solvent refined mineral oil IP346 DMSO extract <3%

4-9% - Methacrylate copolymer (pour point / viscocity modifier)

<0.75% - Alkoxylated long chain alkyl amine (surfactant and adjuvants, eg the "detergent"


That's it, there is bugger all else in Dexron III.

Nota Bene the major constituent is solvent refined MINERAL oil, Dexron V and VI for example are synthetic.

Feel free to Google the chemical compounds / references above, you will see that I am right.

There is no "friction material" in fresh, clean, new, ATF.

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