I recently returned from a road trip of about 6k miles in two weeks. I drove from Seattle to Buffalo,NY and back again. My Focus is a 2009 model and uses Mercon LV ATF. I had a fairly heavy load in the car (weight equiv. of four people) and speeds of about 70mph. Temps where in the 80's and 90's most of the time. Some periods of lengthy idle due to road construction. My question is if it would be a good idea to replace a few quarts of of my ATF with fresh fluid in order to be sure it's still providing ample protection.....or just leave it alone until I reach my regular service interval? I am a bit picky about keeping things up to snuff. My Focus started the trip with around 7k miles and finished with about 13k. Any opinions would be appreciated.
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