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For the 2012 Toyota FJ Cruiser, it is recommended to use 0w-20 oil. It is crucial to use high-quality oil to maintain smooth engine operation. Over time, issues may arise with the oil, potentially leading to engine failure. Signs of bad oil include a burning smell, which should be addressed promptly to prevent any serious consequences like the car catching fire. Additionally, you may notice a knocking noise coming from the engine and poor gas mileage. It is important to replace the oil every 5,000 to 10,000 miles to avoid engine problems. Failure to do so can result in serious engine issues.
Toyota suggests using sae 0w-20 full synthetic engine oil for the 2012 fj cruiser.