Rotella T Synthetic SAE 5W-40 Engine Oil - 1 Quart Bottle, Pack of 6 Delivers 34 percent better wear performance on average compared to the previous API CI-4 PLUS 5W-40 formulation. In seven out of seven industry-standard, diesel-engine wear test measurements, it outperformed the previous formulation Protecting the performance of your exhaust-emissions control systems is not only important for your vehicles to comply with legislative requirements, but also to promote efficient operations Shell Rotella T6 provides extra protection against breakdown by heat and offers up to 70 percent better oxidation resistance, compared to conventional Shell Rotella T3 15W-40 API CJ-4 oil