The 2GR series is known for its robust engineering and high-mileage capability, though owners should be aware of specific age-related wear issues. 

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1. Timing cover: this ugly issue has come up for many owners of the 2GR engine which they quickly find requires removal of the engine to service due to lack of access with the transversely mounted engine. It does some times appear fairly early in the engines life as well (less than 60,000km). One the bright side usually it's a slow leak that can be ignored if one is so inclined as long as you keep an eye on the oil level. 

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2. VVT system: Cold start rattle. This seems to effect the earlier 2GR engines far more than the later ones (prior to 2013). It is rarely a catestrophic issue which likely many owners ignore. 

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3. Water pump: this issue like the timing cover comes up frequently. As the 2GR has a chain driven valve train, it does not require regular timing belt and associated water pump replacement intervals, however this means that the water pump gets forgotten about until it starts leaking. Often occurs around the 100,000 mile mark, and many believe you can potentially extend it's life with early coolant changes. 

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4. VVT line and oil cooler lines: This one was a big "oops" in engineering. The rubber lines for both the VVT system (runs up the front of the engine) and the lines to the oil cooler harden with time and can rupure will driving resulting in the engine pumping out it's oil in very short order most often resulting in the engine being destroyed. This becomes more and more of an issue as the rubber of the line ages. There was a factory recall for this issue so many have been replafced, but it is worth checking. Metal replacement lines are widely available which put a stop to this concern once and for all.