All turbochargers that are sold by Phoenix Boost are covered under the original purchaser for 1 year from the date of sale. Turbos that have been exposed to over boosting, oil starvation, overheating , improper cooling and contamination in oil filter and air will not be warranted. Phoenix boost reserves the right to service, replace or refund parts according to our professional judgement. We recommend using proper oil as required by car/ turbo manufacturer and performing oil changes when necessary.