関連ワード:  is it ok to let a diesel idle    is it ok to let a diesel idle overnight    is it okay to let a diesel truck idle    is it ok to let a deleted diesel idle    is it bad to let a diesel idle    is it bad to let a diesel idle for hours    is it good to let a diesel idle    is it bad to let a diesel idle in the cold    is it better to let a diesel idle    is it bad to leave a diesel idling