The generator matrix

 1  0  1  1  1  6  1  1  0  1  1  0  1  1  1  1  1  1
 0  1  3  6  1  1  0  3  1  6  3  1  0  0  0  0  0  0
 0  0  4  0  0  0  0  0  0  0  0  0  0  4  4  4  0  0
 0  0  0  4  0  0  0  0  0  0  0  0  4  4  4  0  0  0
 0  0  0  0  4  0  0  0  0  0  0  0  4  0  4  4  0  0
 0  0  0  0  0  4  0  0  0  0  0  4  0  0  4  4  0  0
 0  0  0  0  0  0  4  0  0  0  0  4  0  4  0  4  0  0
 0  0  0  0  0  0  0  4  0  0  0  4  0  4  4  0  0  0
 0  0  0  0  0  0  0  0  4  0  0  4  4  4  4  4  0  0
 0  0  0  0  0  0  0  0  0  4  0  0  4  4  0  4  0  0
 0  0  0  0  0  0  0  0  0  0  4  4  4  0  4  0  0  0

generates a code of length 18 over Z8 who´s minimum homogenous weight is 8.

Homogenous weight enumerator: w(x)=1x^0+113x^8+120x^10+803x^12+1184x^14+1024x^15+3691x^16+7168x^17+4560x^18+7168x^19+3691x^20+1024x^21+1184x^22+803x^24+120x^26+113x^28+1x^36

The gray image is a code over GF(2) with n=72, k=15 and d=16.
This code was found by Heurico 1.16 in 1.22 seconds.