Generally speaking a 85w/90 gear oil would be mineral. A synthetic oil has better operating characteristics at either end of a temperature range and so they normally have a wider viscosity difference. i.e. with gear oils a 75w/90 or 80w/140 could well be synthetic
85W90 gear oil.
85W90 gear oil.
85W90 gear oil.
Yes , you still get better fuel economy
85W90 Gear oil.
85W90 gear oil.
85w90 will be just fine.
85W90 gear oil.
85W90 gear oil.
85W90 gear oil
80 or 85W90 gear oil.
80 or 85W90 GEAR OIL.