Advice needed for controlling ooze on dual extruder.......

When using my dual extruder, for printing dual colors, the second extruder oozes a little while the first extruder is working. I am using PLA and have the hotend temp set to 175. I think what needs to be done is to have the extruder retract a couple of mm after it wipes. (tell me if I am wrong).

What g-code do I need to put into slic3r to get the ectruder to retract "Xmm" after a wipe?
I have the prusa I3v 8". I am using slic3r 1.2.9

Here is the current start g-code setup in slic3r:

; 8" i3 & i3v 3mm ABS for .40 Hexagon Double 2014-11-28
M42 P5 S255 ; light on
M190 S[first_layer_bed_temperature] ; wait for bed to heat up
M104 S[first_layer_temperature_0] T0 ; start heating T0
M104 S[first_layer_temperature_1] T1 ; start heating T1
G1 Z5 F50 ; lift nozzle
G28 ; home X and Y axes
G29 ; auto bed level
G1 X0 F8000 ; move to side
G1 Y210 F8000 ; move off front
G1 Z0 ; Level for wipe
M109 S[first_layer_temperature_0] T0 ; wait for heat
M109 S[first_layer_temperature_1] T1 ; wait for heat
G90 ; absolute
T0 ; extruder 0
G92 E0
G1 E18 F65 ; extrude
G1 Y0 F8000 ; wipe
T1 ; extruder 1
G92 E0 ; reset extrude
G1 E18 F65 ; extrude
G1 X15 F8000 ; wipe


Thank you
Bill

I don't have dual extruder but my single oozes between the layers and leaves warts. To fix it,
Under Printer Settings, Extruder 1, Extra length on restart. Try a value -0.1mm and go higher if it still oozes. My printer is happy with -0.25
Hope it helps.

Thank you Joop, I will try it.

Sorry Joop...That did not work for me. Isn't there a G-code I could use to retraact the filament after wipe?