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Can you use 1040 oil in a Chevy blazer?

No, you should not use 10W-40 oil in a Chevy Blazer without first checking your owner's manual.

While 10W-40 is a common motor oil, the *correct* oil for your Chevy Blazer depends on the year, engine, and specific recommendations from General Motors. Using the wrong oil viscosity can lead to engine damage. Your owner's manual will specify the recommended oil type and viscosity. The oil fill cap might also have a recommendation printed on it.