The traditional tunings of the Greek Oud which is of 5 r 6-courses are
The Arabic tuning is
1) G2-A2-D3-G3-C4 (2M-4-4-4) or D2-G2-A2-D3-G3-C4 (4-2M-4-4-4)
2) D2-E2-A2-D3-G3 (2M-4-4-4)
The Turkish tunng is
1) E2-A2-B2-E3-A3-D4 (4-2M-4-4-4)
2) E2-F#2-B2-E3-A3-D4 (2M-4-4-4-4)
We may compare it with the tuning of the Portuguese guitar (https://en.wikipedia.org/wiki/Portuguese_guitar ) which also has interval of 2M
D3-A3-B3-E4-A4-B4 (5-2M-4-4-2M)
and
C3-G3-A3-D4-G4-A4 (5-2M-4-4-2M)
or
C2-E2-G2-C4-E4-G4 (3M-3m-4-3M-3m)
The Arabic tuning is
1) G2-A2-D3-G3-C4 (2M-4-4-4) or D2-G2-A2-D3-G3-C4 (4-2M-4-4-4)
2) D2-E2-A2-D3-G3 (2M-4-4-4)
The Turkish tunng is
1) E2-A2-B2-E3-A3-D4 (4-2M-4-4-4)
2) E2-F#2-B2-E3-A3-D4 (2M-4-4-4-4)
We may compare it with the tuning of the Portuguese guitar (https://en.wikipedia.org/wiki/Portuguese_guitar ) which also has interval of 2M
D3-A3-B3-E4-A4-B4 (5-2M-4-4-2M)
and
C3-G3-A3-D4-G4-A4 (5-2M-4-4-2M)
or
C2-E2-G2-C4-E4-G4 (3M-3m-4-3M-3m)