I had the same Coolant disappearing issue resurfaced again after servicing in span of less than 8 months.
This is after fixing the issue at Adyar service center last November, full engine removal cleaning and fixing the Water seal etc.
off late am riding it very less , 3 days in a week as i take up my CAR frequently because of hot Summer in chennai
3 times in 5 months, i had to top up my KTM duke 390 2017 coolant and it gobbled up atleast 400ml.
my Duke odo is 11000 kms so far and was suggested to change the chain sprocket, planning to do along with this coolant seal replacement again.
very bad from KTM for not offering any kind of permanent fix .




.. i would have understood if it was from jan or feb.. but at the fag end of the yr and still designated a prev model yr. i'll cross check the parts catalog, which has clear info comparing the parts list between years, considering there have been plenty of small and big changes on the ktm's since launch (some which most aren't even aware of).
You can stick to MPSRs or Apollo Alpha Rads, Ceat Zoom Rad X1 or normal Metz. I'd suggest, try the Ceat they offer a blend of grip and life.

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