Why does my 1998 Pontiac transport Montana smoke when you start it?

If your 1998 Pontiac Transport Montana is smoking when you start it, it could be due to several reasons. Common causes include oil leaking into the combustion chamber, which may result in blue smoke, or coolant leaking into the engine, producing white smoke. Another possibility is a worn-out engine gasket or seals. It's advisable to have a mechanic diagnose the issue to prevent further engine damage.