Unless the Manufacturer specifically recommends a specific breaking oil for your engine, (rare), it will not matter if you run mineral, or synthetic oil. Compare them, and you will see that both have nearly identical properties in normal operating conditions. The only real difference in lubricity being, synthetic can handle more extreme temperatures.
Go to an oil company web site, and read their information. Or, send them an E-mail. You will find they will guarantee compatibility, and that running their synthetic oil, cannot, and will not void your warranty if you use it in place of the proper mineral oil. I know for sure, Amsoil will be happy guarantee your engine will be covered, if you discuss that with them.
The mind set in these discussions, seems to always be that there is a real possibility of the engine failing during the warranty period, and that people have warranty issues. But, the reality is, these engines rarely fail during the warranty time period. And my experience has been, when one has, it gets covered no matter what, because it was a serious defect.
I am sure someone on here will say otherwise, but, I worked on vehicles my entire life, and I have never heard of a manufacturer requesting an oil sample, or paperwork to verify anything was, or wasn't used, as far as oil, when an engine failed. It is always a serious defect, and they already know about the problem, from previous failures.
Manufacturers want to avoid the bad publicity involved in things like that. Especially today, with a forum like this, for that kind of information to spread on.