Originally Posted By: Imp4
Well, the reality is that you, as an automotive consumer, will never experience any difference in using these two products.
Not in engine wear, not in gas mileage, not in oil longevity in the sump, not in cold start characteristics, not in high heat performance.
Why not?
Because the typical automotive consumer doesn't experience the high heat, high load, extended duty cycle situations which are required to measure a discernable difference.
As a result, you are left to peruse the marketing materials provided by the OEM, which are specifically written to be non-specific.
Given that, what is a consumer to do?
Read your owners manual, follow the recommendation for specification, viscosity, and change interval.
If you're feeling the itch to deviate from the OEM spec, then go with an SN+ oil once it's available here in a few short weeks.
That's it.
Nothing more.
No need to wait. Go to "when will it be on shelves."
http://www.pennzoil.com/en_us/education/know-your-oil/what-you-need-to-know-about-api-sn-plus.html