H M 
2003 Toyota Matrix Wagon XR AWD 4dr Wagon (1.8L 4cyl 4A)
Loved it Until... The ENGINE FAILED!
 I bought the Matrix new and it was the first one I had seen. I have absolutely LOVED this car...UNTIL THE ENGINE FAILED!! I never had one single mechanical problem, did ALL scheduled maintenance, and it ran perfect up to 94K miles. Then within the space of two days, NO WARNING AT ALL - engine problem. Toyota informs me it has sludge in the engine, and from that day on the engine is awful. Car stalls, slugs along, you name it. Completely unreliable now. TOYOTA claims it is MY FAULT, and completely FAILS to acknowledge a longstanding design problem with the engine. Then tells me I have to pay 8-11K to get A NEW ENGINE. Research Toyota Sludge people!!! Never again Toyota...Sorry.