I checked out the MSDS pages of Valvoline trying to compare Synpower and Durablend. Here is what I found:
Ingredient(s), CAS Number, % (by weight)
- DURABLEND 5W-30 Solvent-dewaxed heavy parafinic distillate, 64742-65-0, 10.0- 20.0 Hydrotreated heavy parafinic distillate, 64742-54-7, 54.0- 64.0
- SYNPOWER 10W-30 Hydrotreated heavy parafinic distillate, 64742-54-7, > 80.0