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15w or 10w or 5w or 0w....is flexible depending on climate...the ending part not so much for me. I absolutely wouldn't suggest any lighter than an HD 5w30 or 0w30 oil made for diesels like Rotella. With the huge compression diesels low lubricity diesel fuels produced today, the lowest I would go is 40wt. (ie 0w40, 5w40, 15w40). There is little to no fuel gain to be had running any lighter and lots of engine wear at risk.
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2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.
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