Craftsman 107.28993 Operator's Manual page 63

Use oil classified API Service Class SG,
SH, SJ or better with SAE Viscosity:
10W-30, 30 Conventional
Or Synthetic
5W-20, 5W-30
Conventional
5W-20, 5W-30
Synthetic*
˚F -20 0 20 40
32
˚C -30 -18 -7 4
0
*Recommended: Synthetic oils provide better starting below -10˚F.
60 80 100
16 27 38