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Any Problem Having Residual Conventional Oil in the Engine When Switching to Synthetic?
 
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Question:
Any Problem Having Residual Conventional Oil in the Engine When Switching to Synthetic?
When switching from petroleum-based motor oil to synthetic is there a concern regarding the co-mingling of residual organic-based oil with the new synthetic oil and if so what are the risks?
-- Don Wilson, New Windsor, NY
Answer:
There should be no concerns with switching your motor oil from conventional to Mobil 1 or Mobil 1 Extended Performance. No special preparation is necessary. Mobil 1 is compatible with conventional oils.
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