Originally Posted By: Benito
I would take the free changes and use the M1 0w40 in the other Charger.
The other Charger calls for xW-20, it gets AFE 0w-20.
Originally Posted By: Benito
The SRT 0w40 was designed specifically for your car and is recommended by your vehicles engineers. In the absence of information to the contrary, you should actually conclude that it is the better oil for your vehicle. You can even take the money you save and get UOAs to see how it performs.
But the problem is you love M1 0w40. For you it is the perfect oil and there is nothing you would like better then lovingly pouring the perfect oil into your perfect car. It would be better than placing a cherry on top of a cake.
The SRT oil was designed (quickly) as a replacement for the original factory fill and spec oil, M1 0w-40, which the SRT vehicles used for years and years until the relationship with Mobil was soured by the bankruptcy. At this time, it only carries the MOPAR approval, not any of the Euro certs. On top of that, it has a higher NOACK volatility.
If M1 0w-40 had never been the factory lube (and approved) for this application, I would agree with you completely, however that's not the case.
Originally Posted By: Benito
Now if that is what you are compelled to do, then I really doubt the warranty could be voided for using M1 0w40. But if I was super concerned about that, I would ask the dealer and manufacturer.
And I intend on doing that. The dealer used to stock only Mobil products and continued to use them for quite a time after the relationship changed south of the border (as I think was the case with most of the dealers in Canada) until the "old stock" was used up.
I am also going to write an e-mail to Chrysler and see what they say.
Originally Posted By: Benito
The other thing to consider here is that you have an opportunity to do some real life testing on whether M1 0w40 is the best oil. Run the SRT 0w40 until your warranty is up, getting UOAs with particle counts. Then run the M1 0w40 and get the same a few times. Buy a bunch of your favorite synthetic oil filters from the same batch now and use them each and every time to remove variability. Do that and with some luck, this thread will still be going in 6 years time.
I don't feel this is really going to tell us much without tear-downs unfortunately. Though I do plan on running the FRAM Ultra filters on it.