My car is a 2007 Suzuki Forenza, 5 speed manual transmission with 115,000 miles located in Alabama. Oil changes are done every 4000 miles. The only issue up to this point has been the low tire symbol that stays on all the time. About six months ago, I noticed an exhaust fume smell within the car whenever I came to a stop, such as at a red light. It has progressively become worse over time. I've taken the car to an exhaust mechanic who checked it thoroughly and stated that there was no exhaust leak. Researching the internet only turned up an answer of maybe the crankcase vent hose has cracked, but that was regarding a 2004 model. Any suggestions?