Is it permissible to invest money through Murabaha in the non-interest-bearing second account of Gulf Bank? Is the status of this bank normal compared to Islamic banks, despite having a Sharia board? Is it permissible to purchase a car in installments through a Murabaha loan from this bank?

It is not permissible to deal with usurious banks, even in permissible matters, except when there is no pure Islamic alternative. This is because dealing with them is considered an encouragement and strengthening of their falsehood, and a cooperation with them in sin and aggression. However, if the bank has an Islamic branch that regulates its transactions according to Sharia (definition) guidelines, then there is no objection to dealing with it in accordance with those guidelines.