So put that whatever to your tribute and stop this "Stupid" Thread. (Sorry, i'm just using ur own words which you frequently use in other threads....)
Any way, guess you can understand the simple thing below.
you are goint to spend ~300K for the conversion
Loss from second hand market ~150K
All together, cost is 450K.
that is 3750 lts of petrol which means additional 37500 KMs.
If you put the diesel engine today and run for 37500 KMs, you recover 150K.
To recover 450K, you need to run 37500 x 3 = 112500KM.
You take the benifit only after 112500th KM.
Anyway, I can guess what your IMPOLITE answer for this also.