The most important factors to evaluate when purchasing a used motor are compression test results across all cylinders, documented mileage from the donor vehicle, oil contamination analysis indicating internal wear, ECM fault code history, and written warranty terms that cover internal components. Avoid any seller offering an as-is unit with no documentation — that is always the highest-risk, highest-cost option in the long run. A quality used motor professionally installed can realistically add hundreds of thousands of additional miles to your vehicle's productive life.
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