I own a dc5r with 175,000 km. For the one year i have owned it the gear shifts have been very smooth and overall have felt very solid. However, the last month or so that is not the case. Gears are much harder to get into than previously and overall quality feels bad. Ive never tracked the car but i do drive the car in a spiritedly manner quite often. I am not sure when the transmission fluid was changed last so i am worried if i do change it i could loosen deposits that have settled into place etc. As for what oil/fluid to use i am not sure for my car. Ive done a lot of research but could not find a good reccomendation for my specific car. Would appreciate any knowledge and recommendations of what fluid/oil to use as i am a noob. Keep in mind the issues i have with the car at the moment and the fact that its a daily and is driven in hot conditions in summer. Thanks.