I have just got myself a 2006 suzuki 1.3 ignis manual mk11. It's my second. One owner 29000 miles it's mint just like new. My question is how best to look after the gearbox. I will change oil every year etc. Is ep 80/90 gl4 the best gear oil or is there a better choice. Ie 75/90- additives. I've read something about broken screws in gearbox. Any advice would be grateful. I'm a very handy with spanner. Thanks patrick from Ireland