I have a Lexus RX300 2001. 180,000 miles. When I check the oil it sometimes only shows a single drop at the bottom of the stick. Just had it changed 300 miles ago. I put 3/4 quart in the last time and the car is driven for a day. Backed car out of garage and there is an oil puddle on the floor. This has happened about 3 times in the past month. I have it changed every 3000-4000 miles and they say usually that its low. Have never had the oil light come on.