The problem I've had at multiple Jiffy Lube type places (this is with a Jeep Wrangler) is that, unless you tell them not to, they'll open up all of the plugs (tranny, diffs, xfer case) to try and upsell you on flushing/filling. Invariably, one or more of them end up leaking. I finally had to insist that they don't touch anything that I don't ask for. I'm going to try the dealer route for the first couple.
BTW, I asked the service manager at the dealer if he recommended synthetic, and he said no. What do you all think? Is he just trying to sell more oil changes?
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