Is it possible to change the gear oil on the ground without a lift or jack?
Yes. That is how I did it. I'm assuming you're talking about the manual transmission oil.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.5 mpg (US) ... 18.1 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)