Jack Posted September 12, 2014 Share Posted September 12, 2014 I have had my 07 MKZ for a month or so and was wondering about the oil requirement of 5w-20. My car has about 94 k on it, is 5w-20 still the oil I should use? I am planning on using synthetic oil. Quote Link to comment Share on other sites More sharing options...
JoeBrown Posted September 12, 2014 Share Posted September 12, 2014 I've never seen any requirement to change the viscosity due to mileage. FWIW I've always used Mobil 1 with the correct viscosity. Quote Link to comment Share on other sites More sharing options...
Jack Posted September 12, 2014 Author Share Posted September 12, 2014 Thanks Joe, I was planning on Moble 1 Quote Link to comment Share on other sites More sharing options...
Harbinger Posted September 13, 2014 Share Posted September 13, 2014 I was told be an oil change "technician" that going from non-synthetic oil to synthetic was bad because the synthetic oil was thinner and might leak through the seals. Quote Link to comment Share on other sites More sharing options...
JoeBrown Posted September 13, 2014 Share Posted September 13, 2014 Wow! I never heard that "urban legend" before. 5W20 is 5W20. Quote Link to comment Share on other sites More sharing options...
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