is there such difference between Heavy Duty oil Diesel and without Heavy Duty Labels with same grade range?
Example: Shell Rimula X Diesel 15W-40 has Heavy Duty labels and recommends for trucks, buses.
While Shell Helix Diesel Super 15W-40 doesn't have Heavy Duty Labels and website says recommended for Auv,Suv and Vans.
same 15W-40 grade, but different recommendation for rides...?




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