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Re: Any MTF that Improves Notchy Shifting? [Re: john_pifer] #5314857 01/06/20 02:09 PM
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SHOZ Offline
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So I'm at about 2 years and 25k on the AC Delco 10-4014 and 150mL of Ceratec. It has been getting more difficult for the trans to drop into a couple of the gears. Nothing bad or grinding but I have to hesitate longer and push harder when the oil is cold. Once I drive an hour or so at 30F temps then it's OK.

What do you think is the normal service life of the AC Delco sycromesh fluids? They are not synthetics I don't think.

Should I be looking into something thinner yet? The AC Delco is a bit thinner than the 75w85 OE recommended stuff as it is.

Last edited by SHOZ; 01/06/20 02:10 PM.

2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Any MTF that Improves Notchy Shifting? [Re: john_pifer] #5315562 01/07/20 08:58 AM
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JmanG Offline
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You mentioned the car has 30k miles which is usually when manufacturers recommend changing the mtf anyway. I recently did a change on my Civic si at 60k after having the same notchy issue.

Figured id start with the OEM fluid and shifting quality has improved 100% as well as on/off throttle trans loading and unloading.

Probably can't go wrong with an OEM fluid but my experience with conventional manual transmissions always says use the correct spec'd fluid and you can't go wrong. Although I am a little more pickier as to what mtf I use in imports as I feel a lot of the parts store brands are designed with more multi vehicle compatibility in mind rather than a quality mtf fluid.

That said, I have always had great results with the reputable brands (amsoil mtf, redline mtl, OEM fluids, Pentosin MTF2 etc) so go with any reputable brand and i think you'll experience better shift quality.

Re: Any MTF that Improves Notchy Shifting? [Re: john_pifer] #5315565 01/07/20 09:01 AM
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Olas Offline
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Im currently using Castrol Syntrans in a gl4 syncromesh application - shift feel equals redline at a significantly lower price point

Re: Any MTF that Improves Notchy Shifting? [Re: john_pifer] #5315739 01/07/20 12:12 PM
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BBDartCA Offline
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You may want to consider Motul MotylGear 75wX0. I recently did a transaxle in a non-turbo 150k mile Subie with the 75w-80 and shifting became noticeable less notchy. And a faint whine in low gear went away. Both Gl4/gl5. Yours probably requires 75w90.

https://www.motul.com/us/en-US/products/motylgear-75w90


Former lube industry insider...now vehicle OEM engineering insider.
Re: Any MTF that Improves Notchy Shifting? [Re: john_pifer] #5331737 01/25/20 11:28 AM
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code5coupe Offline
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The recommended fill for the ZF6 manual in my Corvette was Castrol TWS engine oil. I ran it for a decade, putting up with notchy shifting the whole time. Several months ago I replaced the TWS with Amsoil Syncromesh and am very pleased with the improvement in shift feel. Wish I'd done it a long time ago.


1996 Corvette LT4
2012 Grand Cherokee SRT
1987 VW Scirocco 16V
Misc others , including four 4-wheel drives
Re: Any MTF that Improves Notchy Shifting? [Re: john_pifer] #5332525 01/26/20 09:48 AM
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ChristianReske Offline
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I allways had succes in curing notchy shifting when adding a tube of Liqui Moly gear oil additive (Nr. 1040) to 2 liters of gear oil.
No matter wich viscority or brand of gear oil i used, the LM additive improves shift quality noticeably.

Re: Any MTF that Improves Notchy Shifting? [Re: john_pifer] #5332700 01/26/20 01:33 PM
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Farnsworth Offline
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Chevron Delo xdm synthetic and esi non syn have gl5 gl4 and mt1 ratings. No need to worry yellow metals this or that. I happened upon them while searching. WM sells the esi. May be worth a try Chevron makes good products. I got xdm at AZ store although online said out of stock. Either is in the $7 range per qt.

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