As my cars oil filler cap is below an X-shaped chassis reinforcement, I made myself a funnel + hose combination that fits just right.
It's hard to fill in oil even with a normal funnel in these cars, without one it's impossible without spilling a lot.
Also cut off a cheap toilet brush and stuck it into my cordless drill to clean carpets in my car.
It's quite effective at getting out sand or other simmilar particles.
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