Seems like after age your engine producing black smoke which is causing this black spot on body above the exhaust tip. Go for Bilstein engine cleaner that can renew the engine internal component like new one and will help stop black smoke, pinking and missing (if any)
Check with Emarat, Enoc and Eppco as i remember seing this sometime back, cant remember where.
See if washer is still working or not?
If not then see the water jet, hose, or electric connection is loose???????
If it works, then probably you need to get that fault cleared up with computer diagnostic system.
Take a needle and slowly pass it in the hole from where the water is sprinkled out it will remove any blockage that the hose may have and see if you still face the same problem.
I dont think heat has any co relation, as anyways heat inside the engine is lot higher than africa, uae or antartica......!
Older engine logic i can accept it. Its better to change slightly early in hi run motors.
Why would you change oil at 7000 when oil manufacturer recommends at 10k, just curious. What benefit does that get?
What i know, is that these oil manufacturer always quote conservative figure and even if we stretch 10k - 12k it shouldn't be a problem.....!
Sharjah BM road shops has lot of non genuine parts too, have u tried there. They must be cheaper. Original ones after 50% discount from same shops should cost around 300 -350 for pair.
You can clean AFM with carb cleaner and let car burp once or twice and switch off, start after 5 mins. Do this two to three times and AFM will be clean. Secondly if you dont mind use higher octane fuel for a while like Super (98), it gives more fuel economy by 5% - 10%. and cost 2% extra.
If mileage decreased suddenly its also worth checking or changing CKPS (crank position sensor). Its a small sensor cost about 150 dhs, but when it fails or failing its very famous for big drop in fuel mileage or occasional difficult starting etc.
Violer: i agree with humsefer but dont take offroad, its unlike 2003 model which is quite good. I hope you are changing for on road comfort and upgrades only.