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A gentleman on the Ford Six Forum recenlty got this response from Shell:
Zinc levels are being lowered on almost all engine oils, but the heavy duty diesel engine oils, such as the Rotella T, will continue to have higher levels than the passenger car/gasoline engine oils. Even though the zinc level is being reduced, all the oils will continue to have antiwear protection - they will just use different additives than the zinc.
The Rotella T 15W-40 meets API SL, SJ, SH and all previous specifications for gasoline engines. The 15W-40 viscosity is heavier than what is recommended for most gasoline engines, but if you feel comfortable with it, then there should be no problem. Rotella T 15W-40 is recommended for and used in many mixed fleet applications. It does have a higher antiwear level to protect the heavy duty diesel engines and should give you very good performance in protecting the cams in your engine.
Thank you for your interest in our products! If you have any further questions, please call us at 800 231 6950.
Sincerely,
MaryCarol Boemmel
Lubrication Engineer
Zinc levels are being lowered on almost all engine oils, but the heavy duty diesel engine oils, such as the Rotella T, will continue to have higher levels than the passenger car/gasoline engine oils. Even though the zinc level is being reduced, all the oils will continue to have antiwear protection - they will just use different additives than the zinc.
The Rotella T 15W-40 meets API SL, SJ, SH and all previous specifications for gasoline engines. The 15W-40 viscosity is heavier than what is recommended for most gasoline engines, but if you feel comfortable with it, then there should be no problem. Rotella T 15W-40 is recommended for and used in many mixed fleet applications. It does have a higher antiwear level to protect the heavy duty diesel engines and should give you very good performance in protecting the cams in your engine.
Thank you for your interest in our products! If you have any further questions, please call us at 800 231 6950.
Sincerely,
MaryCarol Boemmel
Lubrication Engineer
