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I would put that 2400 into the saving and let it accumulate interests. If something happen, most likely not with a lexus, I would use that money to pay for it. After 4 years and nothing happen, you are looking 2400+ in the bank.

Excellent writeup. However, why would you want to change the oil while the car is on the ramp? I guess you would want the car to be ground level so all of the oil get out.