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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.
Chevy began production of the HHR in 2006, and offered a 2.2L and 2.4L four-cylinder engines. Chevy quickly opened up the options to include a 2.0L four-cylinder. The manufacturer recommends that you change the engine oil every 3,000 to 5,000 miles using five quarts of SAE 5w30 for all the engine sizes.