6mt fluid recommendations

[Mr.turner85]

Searched but saw a bunch of different possibilities so thought I’d just ask
Which fluid is recommended to change the trans fluid in my 15 RS 6mt. I haven’t checked the OE manual but I believe I read that people have better luck with thicker fluid, I’m assuming that means thicker than what OE recommends. I saw the thread on the 2nd gear grind remedy and planning on performing this the next time I change my oil. So what fluid does everyone recommend??
Pennzoil Synchromesh
Amsoil Synchromesh
Redline GL4 75w90
Redline MT90
Any others?
Thanks in advance
Beau


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[EyeluvSmegma]

I use Redline 70/90 gl4. $50 a gallon on Amazon

 

[Tormach]

I put in 2.5 qts Redline MT-90 back in November.

The next time I change it, I might try the AMSoil Synch.

 

[Mr.turner85]

I put in 2.5 qts Redline MT-90 back in November.



The next time I change it, I might try the AMSoil Synch.

Any particular reason you want to try something different or no reason?


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[6speedti]

http://www.sonicownersforum.com/forum/transmission-discussion/21004-transmission-fluid-change.html

 

[Mr.turner85]

I use Redline 70/90 gl4. $50 a gallon on Amazon

Thanks for the reply btw that’s some username you have there lol


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[Tormach]

Any particular reason you want to try something different or no reason?


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I like the Redline I used, was a positive difference from what was in it. I might try the AMSoil to see if there is a difference only but more then likely I'll stick with Red.

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[Mr.turner85]

Ok I was just wondering thanks for the reply


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[EyeluvSmegma]

Ok I was just wondering thanks for the reply


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Only reason I can see moving to Amsoil is their stand up-stand out. Meaning it's one of the very few auto lube companies that don't hide behind a bunch of "clauses" when it comes to the guarantee. When they say 15k severe service interval, they mean 15k, pretty much no matter what.

 

[Gimpster]

When I changed my factory fill, I went with Amsoil Syncromesh (2.5Q). I've been very happy with the cold weather performance of it, which is a concern for me in Iowa

 

[shibbs]

When I changed my factory fill, I went with Amsoil Syncromesh (2.5Q). I've been very happy with the cold weather performance of it, which is a concern for me in Iowa

Uh, that synchromesh is basically a 5w30 oil, which is a far cry from the 70w that's specified for that trans.

 

[skurtov]

I use Amsoil Severe Gear 75-90W and its quite fantastic.

 

[Gimpster]

A 30 motor oil is roughly equivalent to a 70-75 weight gear oil. The SAE classification for gear oil and engine oils are different.

Common mistake so don’t sweat it.

Uh, that synchromesh is basically a 5w30 oil, which is a far cry from the 70w that's specified for that trans.

 

[shibbs]

A 30 motor oil is roughly equivalent to a 70-75 weight gear oil. The SAE classification for gear oil and engine oils are different.

Common mistake so don’t sweat it.

I knew they were different, but I didn't know how much. Always nice to learn something! Thanks!