After 24 days of testing, including two tests on each truck-oil combination, Shell’s 10W-30 CK-4 engine oil demonstrated a 2.3% average fuel-economy benefit compared with its standard 15W-40 oil ...

Shell Lubricants will continue marketing and selling its four top-selling motor oil labels for diesel engines: Shell Rotella T, Shell Rimula Premium, Pennzoil Long-Life heavy-duty engine oil, and ...