Best Manual Transmission Fluid?

[enyawix]

Amsoil, Mobil 1, Redline, or Royal Purple


remove this found same question

 

[HISSIN50]

I dont think you can go too far wrong with any of 'em.
I use D4.

Good luck.

 

[86bluecobra]

well i just like to make sure im using the stuff ford recomended. I would not put synthetic atf in a t-5. use the oil the t-5 was designed for.

 

[HISSIN50]

well i just like to make sure im using the stuff ford recomended. I would not put synthetic atf in a t-5. use the oil the t-5 was designed for.

Care to expand upon why synthetic is not a good product to use? I think we'll respectfully disagree on this one.

 

[86bluecobra]

ok i know you are a wealth of knowledge Hissin. I respect you also. Here though is my reason. When the t-5 was designed synthetics were not around. I have seen truck tranny's (not the t-5 tranny though) have premature syncro failure due to using synthetic oils because of the fact they are slipperier then regular oil. This may not be the case with t-5 tranny's as i mentioned but I think that using the reccomended oil that ford says to use would be the best.

 

[Daggar]

The reason you don't use anything other than Mercon is primarily because of the incompatability between other types of fluid and the seals and needle bearings (if I remember correctly, they were the culprit) within a T-5. If you have a tranny that's been rebuilt by say... "Speed Shop X" for use with other types of fluids then press on with pride. Otherwise... stick with the manufacturer recommended fluid. It's what the tranny was designed to run with.