How bad is our Lexus IS300? Today we find out! In today's episode of throtl, Quinn takes a deep dive into the engine bay of our 2005 Lexus IS300 to perform some basic maintenance. It has been a while since this 2JZ-GE engine received some TLC. The engine oil is black, the coolant is miscolored and the performance is sluggish. Quinn starts off by replacing the spark plugs and engine oil, then later proceeds to replace the timing belt, water pump, and some blown seals. After performing some basic maintenance, Quinn takes the IS300 for a test drive where he notices a massive increase in throttle response and performance. Check out the video below to see the satisfying process of bringing our Lexus IS300 back to life!