Should Engines be Flushed Prior to Switching to Synthetics

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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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