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Heritage High Roof is what HHR actually stands for. It's pretty self-explanatory, but we get paid to fill this white space. By heritage, GM means the 1949 Chevy Suburban echoed in the HHR's bulldog face and baggy fenders. The roof actually looks low from the outside, thanks to pillbox windows seemingly cut by a hot rodder's torch, but it's not.
Oil Weights and Amounts. All engine types for the Chevrolet HHR for model years 2006 through 2010 use five quarts of SAE 5w30 oil. Chevrolet recommends a synthetic motor oil for use in the vehicle. With higher mileage engines, you want to use a high-mileage oil or an oil additive to recondition and maintain your engine seals.