Oil Manual is a neutral engine oil reference that explains viscosity grades, oil specifications, OEM approvals, substitutions, comparisons, and oil-change costs in plain English. It is built around one idea: check your manual first, understand the spec, then choose the oil.
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Oil Manual explains viscosity grades, API, ILSAC, ACEA, dexos, OEM approvals, oil substitutions, climate, intervals, and common comparisons in plain English. The goal is to help drivers understand the requirement before choosing a product.
It is not meant to replace a mechanic or the car manual. It is a neutral reference layer for people who want to make a better decision before an oil change.
Would love feedback on clarity, trust, and which oil questions should be covered next.