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Should Engines be Flushed When Converting to Synthetic Oil
 
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Question:
Should Engines be Flushed When Converting to Synthetic Oil
Should you "flush" an engine prior to converting to synthetic oil? The engine has 40,000 miles on it.
-- Frank Tubbs, Saint Joseph, MO
Answer:
You do not need to flush your engine prior to converting to Mobil 1 fully synthetic oil. However, if your vehicle has been poorly maintained, ExxonMobil suggests a relatively short first oil change interval (3000 - 5000 miles) with Mobil 1. The special cleaning agents inside all Mobil 1 formulations will help reduce sludge and deposits. To ensure that these deposits leave the engine quickly, a short first oil change interval is recommended. If the vehicle was severely neglected, a second short change interval may be warranted.
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