Hot climate and track proven transmission oil - Redline, MotorCraft, Amsoil?

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Feb 2, 2018 | 07:08 PM

2slow

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Joined: Jul 2016

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From: San Diego

Hot climate and track proven transmission oil - Redline, MotorCraft, Amsoil?

What are the latest recommendations for 5 speed (stock power, hot climate/track/auto-x)?

I know previously the most recommended were:
Ford Motorcraft
Redline MT90
Amsoil FGR (kind of hard to find)

and back in the day Emillio recommended adding 2oz of GM limited slip additive #1052358 to any trans oil. Does this till stand?

Feb 7, 2018 | 01:56 PM

stormin'norman

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Joined: May 2010

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From: Portland, OR

I used to use RL MT90 in my 5 speed but it would begin to feel notchy and generally grainy/rough feeling after 2-3 events. It's not common and can be hard to track down at times but I've been using Dumonde Tech Gear 9 for many years.

It seems to thrive off heat and abuse.