Unless you're under warranty and have concerns with that I'd use it just as it is. I had a 1988 Ford Escort for years that recommended 5w30. I used 10w40 in it and when I retired it it had 518K miles on it without a rebuild. Now I own a 1997 Ford, 2002 Ford, 2016 Nissan and run 10w40 in them year around without any problems. Check your owners manual, likely somewhere in it will be a graph showing what weight oils you can use at different temperatures. Some will argue you get better gas mileage with lighter oil but, I am not convinced of that I actually think in some cases the lighter weight oil may cause more friction and increase wear. Since I bought my Nissan Versa about 13 months ago and have tracked approximately 10,500 miles my overall average gas mileage is 47.082 MPG with my worst tank being the first tank I ran through it at 42.345 MPG and my best at 51.167 MPG. My average MPG is 8.082 MPG better than the car's highway EPA rating of 39 MPG and 13.082 MPG better than it's combined rating of 34 MPG.. My worst gas mileage this past winter using the 10w40 and winter blend gasoline was 45.612 MPG. The original factory recommended oil on my '97 is 5w30, on the '02 5w20 (same engine), and 5w30 on the '16.
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