Vehicle: 2008 Lexus IS350 Issue: Excessive oil consumption and fuel/exhaust odor I am experiencing what I believe is excessive oil consumption with my 2008 Lexus IS350. Ive had to regularly add oil between scheduled oil changes, and Ive noticed that the oil level is frequently low with no external leaks visible. Im concerned that this may indicate a known issue with piston rings or internal engine components. In addition to the oil issue, I have recently started smelling strong gas or exhaust fumes while the engine is running, especially at idle or when the car is warm. I am worried that this may be related to catalytic converter damage caused by prolonged oil burning. I believe this may pose both a safety risk and an environmental concern, especially if the catalytic converter is compromised. I have not yet received any recall notices or service bulletins related to this issue, but I am aware that similar Toyota and Lexus models have had oil consumption problems tied to engine design.