Two problems related to engine and engine cooling have been reported for the 2000 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Toyota 4Runner based on all problems reported for the 2000 4Runner.
Replaced engine with a rebuilt on, because engine bad design. Oil passages too small . No help from Toyota who designed and made the engine. Damaged occurred over time: sludge build up, gritty sludge.
Diagnosed with engine sludge. Still has milage left on warranty. Denied warranty because Toyota said I either didn't change oil or used low grade of oil quality.