This is a funny question because I have never heard of an unreliable Toyota engine- well at least since the Toyota Crown came out in the mid 60s. All of them are very reliable. The most reliable would probably be the R series engines (such as the 2.2 liter 20R engine and the 2.4 liter 22R/RE engine). Those are the engines used in the Celicas, Coronas, and pre-Tacoma Trucks. Those vehicles are well known for passing 500,000 miles without a hitch. The 2.0 liter 3S-FE/3S-GE engine (Celica/Camry)and the 2.2 liter 5S-FE (Celica/Camry/MR2 N/A)engine are pretty close too and they are much more modern engines. The 2TZ-FE and 3TZ-FE (both 2.4 liter engines used in the Previa and Tacoma) are also on par with those engines. Any engine ever used in the Toyota Corolla are super reliable and can easily pass 300,000 miles virtually trouble-free- especially the 1.6 liter 2TC and the venerable 1.6 liter,4A-GE.
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