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I’ve done a bit of reading on the web, and as usual, nothing but conflicting information. Some people praise synthetic fluid in the T-5, others say it’s the kiss of doom.
This was the best and most sensible answer I found:
[i]”The transmissions remain essentially unchanged for 30 years, so what makes people think a different fluid is needed? Is it marketing hype? Good advertising? Wishful thinking? Conspiracy theories about planned obsolescence? Too many Slick50ZMaxProlongLucas infomercials?
Fluids are determined based on the materials used in the transmission, bearing clearances, and intended use. If you’re significantly changing those factors, then maybe a different fluid will work.
Borg Warner spec’ed Dexron ATF. Tremec spec’s Dexron ATF. You can believe the marketers or you can believe the people who cover the warranties.”[/i]
It depends on weather or not your T-5 is a World Class or not. The World Class uses normal ATF, while the non World Class does not.
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