Well. Calm down. What you wrote may be true but it merely demonstrate that Russia Air Force is still a very effective Air Force with good logistical support and a huge pool of highly skilled maintenance engineering personnel.
Russia Air Force has never revealed how frequent they swapped the motors for these fighters, MTBO, lifespans, etc. Since these products are manufactured by Russia Defense Industries, the Russian Air Force will be given TOP PRIORITY, no doubt, in these situations.
However the reputation and the problems, operators of the SU-30 variants with its AL-31F series does not disappeared because of that.
In March 2015, after the entire SU-30MKI fleet was grounded for safety reason and inspection, Indian Defense Minister Manohar Parrikar revealed that the twin-engine SU-30MKI have serious failure-prone motors and its breakdown frequency is very alarming.
In its 2015 report from HAL, India to NPO Saturn, HAL listed 69 identified failures in the AL-31F which included metal fatigue leading to premature bearing failures, lack of oil pressure, excessive vibrations, etc. This resulted in POOR SERVICEABILITY and low availability of aircraft for normal operation at any given time.
There is NO MAYBE in all these but factual event.
So you see RMAF is not alone with these problem and the Malaysian Defense Minister have even approaches China to assist them in the maintenance of these engines but due to covert agreement between China and Moscow, the Chinese declined. In June this year Vietnam Air Force reported one of its SU-30 MK2 crashed and went missing.
BTW all the AL-31F engine have to be returned back to Moscow for maintenance and Moscow will send replacement spare motor.
China is the only nation that never send their AL-31F series engines back to Russia as these engines are refurbished and maintained at Xian.