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04-15-2019, 09:56 PM
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#11 |
  
Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
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Yes, your mileage will go down as your operating temp oil weight is going from a 40 to 50. It shouldnt hurt your fuel efficiency a ton, but it will have a negative impact.
Why the heck would you want to run a 10w50 in the 1nz? Even with 300* oil temps you would be way out of oil pressure spec and have potential flow issues. On top of that your oil temps would be much higher
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