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Old 03-27-2019, 06:59 AM   #11
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My PS is still the same nastiness. Tranny fluid change will be done first. I couldn't do the job yet because I couldn't find an 8mm allen, had an 8mm allen socket but I couldn't get to the drain plug without moving the dog bone bracket.

So unless I totally misunderstand things the difference in viscosity at 100C is very close between 15w-50 and XT-M5-QS and about double that of Mercon V:


Mobile 1 15w-50
Viscosity: cSt @100C (ASTM D445) 18
https://www.mobil.com/english-us/pas...smobil-1-15w50

Ford spec WSD-M2C200-C ( XT-M5-QS )
"particularly recommended for IB5 and 1995-2011 MTX-75 transmissions"
Viscosity: cSt @100C 15.4
https://www.fcsdchemicalsandlubrican...ission%20Fluid

Mercon V ATF:
Viscosity: cSt @100C 7.5


I know there's other properties to consider though. It seems based on this data that Ford is recommending tranny fluid that is much thicker than the Mercon originally spec'ed. Ah well, if I don't like how it shifts I can just change it. Appears that 1turbofocus is a performance guy and so what works best for him probably isn't the best stuff for my stock focus.
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Old 03-28-2019, 02:53 AM   #12
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Uh, he has to work with the same laws of physics that you do.............viscosity matters much more in ATX as the millions of dollars of shift condition development is based on the thickness of the fluid going through tiny metering restrictions, MTX has none of that. As well, most of the properties of ATX fluid have to do with the clutch pack linings which are also not in MTX and therefore the fluid does nothing there again. Same almost with PS fluid, most of the ATX content is wasted.

Most MTX used to run oil weights from 75-90 weight, it was a norm for 60 years.

Best to run what is specced and any variance from that probably on the basis of cost alone, don't think you are going to be improving anything there. The quickest wearing part in MTX is usually the brake on each synchro ring and that actually can be better using thicker oil and why they did it like that for so long.

I don't do MTX any longer but if I did I would be using cheaper product but changing MTX fluid every 40K miles or so, they go way too long and then you change it but damage already done by then. Look at the most common MTX complaint, or not shifting easy due to synchro wear. It comes from longterm running of the fluid with metal particles in it.

We worry all day long about engine oil but leave the trans fluids in there forever, a perfect example of American daffiness.
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Old 03-28-2019, 08:54 AM   #13
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Well my fluid is about 20 years old with 130k on the odo and stock clutch, so I suspect there's some damage, although it seems to shift fine. In fact most of those miles have been in 5th gear and not typically driven hard. Rarely have I ever grinded gears, most gear grinding happens when I take it into a shop for stuff like tire changes. 9 times out of 10 the mechanic that drives it will grind the crap out of reverse and that is _after_ I instruct them on how to put it into reverse.

I try very hard to do everything myself these days.
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Old 03-28-2019, 12:23 PM   #14
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Why you trying to stick motor oil instead of gear oil in your manual transmission?

Last edited by AdhesiveTeflon; 03-28-2019 at 12:31 PM.
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Old 03-28-2019, 01:22 PM   #15
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Welp finally got it done. Used one of those aquarium pumps you can buy at Walmart to put the fluid in, comes with plenty of tube too. Jacked up the vehicle on the driver's side to get it drained and get the fluid started. Drained into a pan and then emptied it out into empty motor oil quart containers to measure what drained which was approx 2 quarts. Then i let the car back down on its wheels to finish putting in the fluid which was a little over 2 quarts.

Started her up, let it warm up for a few minutes and cycled through the gears. Took it for a spin after running over some stuff I emptied out of the trunk and forgot to move. Started out driving like a granny for about 10 miles then shifted through 3rd/4th/5th gear, downshifting and upshifting. After that I wotted it from 1st to 5th taking it up to 6k rpm. No issues moving into gears, seems to be quite smooth. Inspected for leaks when I got back, no leaks, no funny smells.

I attached a pic of some of my old tranny fluid. The pan wasn't clean to begin with, had some dirt in it, but most of the specks you see are metal. The way the fluid looks I think it should've been changed well before 100k miles.
Attached Thumbnails
Changing PS fluid with Mobile 1 15/50 today-oldfluid.jpg  

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