I am sorry i couldn't update about it, got it checked from toyota, there was no leakage in any pipe, only thing wrong was a clump that was loose, they just tightened the clump and asked me to take a ride and come back after 5/10 km drive, i came back and there was no leakage.
Second yes, its an S grade and its with leather seats. At the time of purchase you can have as many add ons as you want in your car, so the person who bought this had the leather seats add-on.
The only difference between this and G grade is the cruise control.
Third. Yup i got it for 750,000 JYP, if you search well and deep you can get similar grade car around 8 lac jyp mark. Depends on the auction company.