I have 4 c3 tanks , have .5 and .25 coils , prefer the .25 , I run them all day every day at 45w on a DNA 75 and get 3 to 4 weeks on A coil , lowest one was 3 weeks and have had 5 weeks pass and changed because my adv is a cinnamon cereal and really gunks up a coil . I haven't tried the kanthal ones yet but I will look for some now . I have ran the .5 coils and ran them at 55 w with no issue and great clouds and flavor , I have heard the (you need high wattage on a crown to make it shine ) I tried ....3 -4 days and was changing coils . I have multiple og crown tanks , 4 se1 tanks and coils for days ..except for a batch of bad og coils I have had very good luck . Try it out at 45 and see how you like it , the c3 does not need massive power to shine ..
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