Between "car" based gear oils like Mobil 1 or Pennzoil Platinum, and "truck" based gear oils like Delvac 1 and Spirax?
Is it simply marketing and approvals? They all seem to be GL5. My brain wants to think the truck based ones are for slower speeds and heavier loads and may not do as well at high speeds (foaming or similar), but I really have no idea.
Is it simply marketing and approvals? They all seem to be GL5. My brain wants to think the truck based ones are for slower speeds and heavier loads and may not do as well at high speeds (foaming or similar), but I really have no idea.