I recently had a car in with a few oil leaks in the engine so I started stripping down a few things to see what I could fix and this is what I came across inside the engine.  This is the result of using cheap nasty oil. My advice as always, good oil only costs 20 Dhs more. Use it. If you think what you see on the outer parts of the engine looks bad, just imagine how the insides must look. The oil won't be flowing properly and all sorts of damage will be occurring.