関連ワード:  is it better to let a diesel engine idle    is it good to let a diesel engine idle    is it good to let a diesel truck idle    is it better to let a diesel engine idle or shut it off    is it bad to let a diesel engine idle    is it okay to let a diesel engine idle    is it bad to let a diesel truck idle    is it okay to let a diesel truck idle    should you let your diesel engine idle    should you let a diesel idle before turning it off  
結果 : is it better to let a diesel engine idle