I used Royal Purple once a year for my transmission fluid change on my 2001 C5 and the transmission outlasted the motor with daily driver duties for over five years. Car was auto and had seen plenty of abuse including manual shifting highway pulls and such. Royal Purple worked great for me. I'd use it again. I trust AMSOIL as well. Just my 2 cents.
-Alex
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2012 GT Premium Hardtop with XX Transmission
Mods page: http://dfw50s.com/showthread.php?t=3376
Ford Racing . Pypes . BMR . CDC . American Muscle . DDM Tuning . BFG . J&M . Amsoil . MMD. JLT
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