I recently had my tranny flushed and filled with Royal Purple A/T fluid. This stuff is amazing. It's fully synthetic and used by many performance shops/cars. I instantly noticed a difference with my car, it runs better, shifts quiter, and I get much better gas milage! I also (today) just changed my oil with Royal Purple 5w30 synthetic oil and noticed that it runs really smooth and idle is better. I highly recommend this stuff in any scenario whether you're racing or just getting groceries.
Price: About $9/quart for the tranny fluid and about $5/quart for the oil
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