From the Shop

Car care tips, honest repair advice, and answers to the questions we hear every day in our Fort Collins shop.

Which Diesel Engine Oil Is Best for My Vehicle?

The best diesel oil is the one that meets your engine maker's spec in the right viscosity. Compare 15W-40 vs 5W-40, synthetic vs conventional, and CK-4.

Updated Oct 2026

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From the Shop

Which Diesel Engine Oil Is Best for My Vehicle?

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