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Can Synthetic Motor Oil be Used in a Subaru Turbo?
 
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Question:
Can Synthetic Motor Oil be Used in a Subaru Turbo?
Specific to my 2005 Subaru Legacy Turbo - the dealer discourages use of synthetic oil stating that the variable valve timing, which is oil pressure actuated, is adversely affected. The recommended weight is 5W-30. Please comment.
-- John Peterson, Rochester, NY
Answer:
There is no issue using Mobil 1 5W-30 for this application. We would add that changing viscosity grades could impact performance of the hydraulics of the variable valve timing, but not simply changing to a synthetic product like Mobil 1. Remember to follow the recommendation in your owner’s manual.
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