How do you change gearbox oil for Renault laguna 1.8?

To change the gearbox oil on a Renault Laguna 1.8, start by ensuring the vehicle is on a level surface and securely raised. Remove the drain plug from the gearbox and allow the old oil to fully drain out. Once drained, replace the drain plug and remove the fill plug, then use a funnel to pour in the new gearbox oil until it reaches the proper level. Finally, reattach the fill plug and check for any leaks.