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I go with the Rotella.
FWIW I spent a number of years as a maintenance engineer and was a member of the Society of Tribologists and Lubrication Engineers and would never recommend the use of synthetics in an internal combustion engine unless you do a lot of cold weather starts.
The reason is that synthetics have a higher purity level than the stuff out of the ground. This purity level advantage goes away quickly in an IC motor. When we first put synthetics in rotating equipment at work we upgraded the equipment housing breathers with bladders, so we would not draw in contaminants from the air. The reason was that same, if you contaminate the synthetic you lose the lubricating advantages it has. Almost all synthetics have a better viscoity index, which means their viscosity is affected less by temperature. This is the benefit that helps with low temp starts.
FWIW I spent a number of years as a maintenance engineer and was a member of the Society of Tribologists and Lubrication Engineers and would never recommend the use of synthetics in an internal combustion engine unless you do a lot of cold weather starts.
The reason is that synthetics have a higher purity level than the stuff out of the ground. This purity level advantage goes away quickly in an IC motor. When we first put synthetics in rotating equipment at work we upgraded the equipment housing breathers with bladders, so we would not draw in contaminants from the air. The reason was that same, if you contaminate the synthetic you lose the lubricating advantages it has. Almost all synthetics have a better viscoity index, which means their viscosity is affected less by temperature. This is the benefit that helps with low temp starts.
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