aik to front accidental hai .. so it can be (khuda na khwasta) some internal engine problem
it should not take more than 5 minutes for the engine to warmup meaning the cold engine light should go off in about 2-3 minutes .
how much is the total milage of it ? what engine oil are you using ?
waise although i dont have this problem and have not heard of such problem from anyone else.
i have wagonR 2012