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EVs have gearboxes full of oil just like other cars, although much smaller as there's only two cogs.
They also have coolant to keep the battery cool while fast charging - and heavy-footed fast discharging - which also circulates through the electrical control boxes. They usually don't have a huge delicate radiator up front waiting to be bashed like ICE cars.
Diesel is far worse for making roads slippery. Engine oil is too thin and just soaks in. Not sure about gearbox oil.
grams
Do EVs have an oil system for cooling lubrication like a ICE?
I had a nasty crash yesterday in the rain on a road with a huge streak of diesel and engine oil likely from a bus. There was a good 1000m streak off it around the roundabout and then up the road.
My immediate thought was I can't wait until EVs become more commonplace and roads don't get coated in oil / fuel which eventually runs off into environment.