関連ワード:  why is it bad to let a diesel idle    why is it bad to let a diesel truck idle    is it bad to let a diesel idle for hours    is it bad to let a diesel idle in the cold    is it ok to let a diesel idle    is it ok to let a diesel idle overnight    is it bad to let a diesel engine idle    is it bad to let a deleted diesel idle    is it bad to let a diesel idle to warm up    is it bad to let a diesel car idle