6.8 quarts
The Lexus is250 has two oil quantity possibility's. One is 6.6 quarts of oil , one is 6.8 quarts of oil.
5
5w30
The recommended oil type for a 2004 Lexus GS 300 is 10 W 30. The oil capacity for the car is approximately 5.7 quarts.
This car does not come with a regular filter, underneath the car you will see a round metal cover unscrew it and replace the inside, that is your oil filter.
5w30
5W-30 Synthetic Oil.
5 quart
5w30
6.5 quarts of oil
take it to the dealer