<human>: Can you summarize the given text in a few sentences?

Recently my car developed an oil leak, so i asked my landlady (who I live with) if I could use the garage for one day to fix it. She was hesitant as I may drop oil on the garage floor (WTF its a garage....) so I said i'd buy some carpet to soak up any oil that may spill on the floor. She agreed and I said I would do it on the weekend I get back from holiday. Bear in mind that if I were to get this professionally fixed, the bill will be around $1200 and the part was $25 so it was worth it for me to do it myself.

So when I came back from holiday to complete the work on the agreed date, I instead find her big Range Rover parked in the middle of the double garage. I asked her if I could move it to the side so I can complete the work, to which she replied no as "Plans had changed". Well now I'm pissed as I am not going to spend $1200 due to her being an indecisive bitch.

I recently done an oil change on my car and still had the old oil leftover, so what I did was tip about 25 ml (1oz ish) of oil underneath her car to make her think her car had a minor oil leak and smeared a little around the bottom of the sump and the sump plug. When she parked her car outside I would also do the same to make her think it was fresh oil and did this for about 3 nights until she noticed. She then booked in a service at the dealership which from what I understand cost around $400-$500.

Take that bitch, try make me spend money unnecessarily, I'll do the same.
<bot>: My car had oil leak, landlady wouldn't let me fix it. Made her think car had oil leak, made her spend money at dealership.