I purchased a new Mitsubishi Colt on 1/3/09 it has just over 3000 miles on the clock. My journey each way towork means I am in top gear only changing down at roundabouts/lights/heavy traffic. My car just over a week ago developed a loud metal noise, I then lost gear managed to get it into 2nd gear and park up.....The manufacturers are saying the parts are not fault....

Hi Costas, Very good idea and often overlooked by too many. Its good to change the fluid once or tice a year depending on the number of miles driven, but even if the vehicle remains parked for the year, it needs replacing. Drain the fluid and drop the oil pan,and remove and replace the internal oil filter. (Some Mitsubishi vehicles have external oil filters fitted making the job easier. Replace it and the drain plug and then refill. Check the level with the engine running at idle speed and after getting in with park brake engaged and pressing the foot brake and changing through each gear, pausing between each change (including reverse) and return to N. Check oil level on dip stick. Regards John

usually between 60000 to 100000 miles on most diesels

I'm guessing standard transmission? Think about getting it checked. It sounds like the splines (areas where your gears fit/mesh together inside the transmission housing) may be coming loose or for some reason are not fitting together like they should. Are you having any issues changing gears? Have you noticed any excessive play in your gear shifter? Is any fluid leaking out from the housing? I'm thinking something is loose in the housing itself or you may also get the clutch/throw out bearing checked - sometimes that can cause vibration/rattling or even a whining noise as it's going out.

i had the same problem you might want to change the egr valve its located under the valve body it looks like a thermostat

fluids/levels should be checked every 1000 miles.you may need to bleed system if you encounter spongey pedal...

First drain completely out whatever is in it. All the gear boxes and rear ends use 90w gear oil. Buy a name brand.Some of the really cheap stuff is recycled used oil.
I hope this helps you.

check transmission sensor, I hope is not time for a new transmission

synchros may be going out

solved cheers!