The predecessor to the 1GR-FE, found in older 4Runner and Tacoma models — a genuinely strong bottom end paired with a documented head gasket design that proved prone to coolant seepage on a subset of examples.
This engine shares much of the bottom-end durability reputation found on its 1GR-FE successor, and genuinely high-mileage examples are common. The documented weak point is head gasket seepage, generally external rather than the more serious internal mixing with oil, but still worth screening for given how widely discussed this specific issue is within the Toyota truck community at this point in the engine's life.
Not a guarantee, but a pattern seen consistently across owner forums and independent-garage reporting.
Timing belt and water pump service — non-negotiable, regardless of how the engine sounds or runs.
Head gasket seepage, where present, typically becomes noticeable within this range.
Examples with documented belt service and no gasket symptoms commonly continue reliably well beyond this point.
Get documented proof of the last timing belt replacement, a hard-and-fast requirement on this interference-design engine.
Check for coolant seepage around the cylinder head area, and ask whether the gasket has ever been addressed.
Check coolant level consistency over a few days if possible, since a slow external leak may not be immediately obvious on a single inspection.
Model-specific pages, with notes on how it behaves in that particular car.