Minimum to look for is 12 months/12,000 miles, we extend the mileage to 36,000 miles and offer options up to 36 months as well. Be careful about extended warranty plans. This is not necessary for a high quality engine that is backed by the manufacturer. Some installers boast about a much longer warranty period standard but rarely back it up or stay in business long enough to handle any claims. Many companies that offer a longer warranty charge high deductibles, limit labor coverage, or prorate the warranty. Truth be told a defective engine will show itself very quickly so extended warranties are rarely worth it. Motorworks of NY’s 1 year 36,000 mile warranty on our remanufactured engines is never prorated, it is the same on the last day as it was on the first day. If a longer warranty makes you feel better we do have extended warranty plans on our remanufactured engines up to 3 years 36,000 miles (price varies per engine), but it is usually money better off in your bank account.