How many Drain & Fills before full transmission/filter service?

Did search here; it helped. Our 2019 CX-5 we got new. Now 66,000 miles, and mechanic and I talked. He suggested pull drain plug, drain and refill ATF. Then, a little later do full service. I went to Foothills Mazda dealer in Spokane and asked, "Parts," man how much fluid to buy. He said 4 quarts is all I need to change fluid. I asked if there was a gasket kit; service kit; filter, etc., kit, and he said NO, just drain and refill. "No filter l- there was NO kit." Said 4 quarts is all I need. Made no sense to me, but I came home with 4 Qts. of Mazda ATF for about $80. (Whew)

So I look at fluid change you tubes tonight and, sure enough, seems I was right there is a kit for pulling down pan and doing full service. Gasket, drain plug washer, and an, "L," shaped black plastic house to replace. Then I find that the full, "system," is more like 9 quarts. (Probably part sits in torque converter) So I'm thinking this week when mechanic does oil change I'll go ahead and have him dump 4 quarts, and refill with fresh. Then search for all the other stuff to do it fully in about a month.

Do you all BUY from dealers for these kits and fluids? Tips???? I think that parts guy just thought I wanted to do drain and fill, even after I quizzed him about a full kit.

We're retired, wife with health issues, 80 miles to city doctor, etc. I need to keep this car going because I doubt we'll ever have the money to buy new or near-new again. I wonder how long these transmissions last????? Thanks for thoughts, Dennis in E WA state
 
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