[turbong]

It's quite remarkable the turbo lasted even 200k on the conventional oil and even with the replacement side by side comparisons from the turbine with 500k looked new in comparison proves the importance of using full synthetic on turbo engines. In a real world use case I am sure the conventional engine would have lasted no more than 200k at this interval but still proves how far oil and engine manufacturing has come.

 

[turbong]

It was an interesting test for sure but somewhat skewed IMO since conventional oil is not designed to be run at 10K change intervals so the varnish build up is actually less than I would expect from such extended change interval on conventional oil. Conventional oils are normally meant to be changed at 3K to a max of 5k miles, I would never use conventional oil in any turbo car for sure and especially not a hi po one like the mustang.

I know we have discussed this before, but I will never leave any oil in my car for 10K be it full synthetic or blended period, just cannot bring myself to do it after fixing and rebuilding engines for 50 years as a master tech and seeing the effects of poor maintenance practices. Again, that just me and my belief that oil is cheap compared to engine rebuilds. Plus I only put 6-7k miles a year on my car now that I am retired and most of it is short trips, so I change it every 3-3.5k or 6 months whichever occurs first. I just don't want the moisture, and corrosive contaminates to be sitting in the engine for more than 3k or 6 months. I also do all my own work so not having to pay labor cost just oil and filters. I don't trust anyone else to work on my cars or bikes.

BD

It is a bit skewed but in reality it shows how far oil tech has come for it to go as far as it did using the wrong oil and double the interval time, realistically it would have been better to see the results at 5k regardless conventional oil should not be used. It also show cases how you can get away with 10k oil changes on synthetic(not that I would do that) but still capable. Realistically synthetic oil would place it somewhere 6-7.5k range change interval optimally for mostly everyone. Regardless the head gasket would be more of a concern than oil changes intervals as that seems to vary more wildly.