Date registered: Mar 2019
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2013 GL 550 with original trans and diff fluids
Visiting with friend who has 2013 5.5 GL ... 120,000 miles and has never changed transmission fluid. Nor differential fluids. She said local indie said not to change either.
Given the mileage, what is the recommended course of action ... I'm familiar with the argument regarding changing old fluid, but know the argument is simply that ...
Options: do nothing, flush/change, or partial change to avoid "fluid shock?"
My person opinion on the trans - limited background - is to pick a safe spot for her. Have indie drop pan and replace filter, replace that fluid. Then drain and replace fluid two more times. Gets new fluid, avoids rapid cleaning, and replaces the filter. If it was mine, I would drop the pan, see if it had a torque converter drain bolt and drain it as well.
Differentials and transfers are a different beast. I would probably drain and replace rear differential, for sure, but no real feel for the front and transfer case.
BTW - I had posted this in the wrong forum with the wrong date yesterday - trying to get it where it needs to be today. Sorry if any confusion.