I think the consensus on this forum is that a quality oil is much better than any engine cleaning supplement, and I tend to agree with this. There are, of course, other opinions.

As far as the tranny fluid filter change, one would think that the dealer would use the correct fluid and filter for the tranny, which if you look in fastlane, totals about $100 for 8 liters of $10 fluid for refill (that includes torque coverter fluid change, which would probably be considered part of a "power flush") and a $20 filter kit. And these are fastlane prices, the dealer will be charging more. So half of the $300 dollars is probably for these items. Make sure aamco uses synthetic or oem fluid for the change. It is important.

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headrivenoise... listen.