TZORRO,
I'm an unsual oil sales rep. I don't recommend full synth's in an auto normally as they are not needed for standard engine applications. Myself, I don't believe that you get better protection from a synth oil over a conventional dino oil just because it is a synth base oil. It's got a lot to do with the additive packages used in the oils, many of which are not as good as what is used in some synth's but then there is some good mineral that do use a good package.
I started out to prove this by using my car, 95 ford escort, running one brand of oil, where the synth blend and the mineral oil both have identical additive packages.
I started with the blend which has 25-28%PAO synth base oil that is mixed with the mineral oil and ran it with a M1 filter for 4,000 miles. Sampled and Drained, then I switched over to the mineral counter part which is identical of the blend with exception that this has no PAO but uses the same mineral base oil as the blend.
Ran it for 4k miles with the cheapest fram filter available for my car and sampled.
What it showed was the mineral oil had lower wear numbers than the blend with the synth base oil. Now, I expected it to show simular but not better, but what I have come to learn since is that the cheap filter actually provided better flow(less filtration than the 14.00 m1 filter) so, it was able to provide better oil pressure to my bearings keeping a better oil wedge in there. This is one of the main things that contributed to the lower wear numbers.
So in a nutshell, you will not have a problem with a good mineral oil but as suggested by Al, I believe that you should at first, consider doing analysis so that you can qualify your drains with the oil you use to establish that it is providing you the proper service you expect with no surprises.
To see this little test I did on my car, here is the link.
Topic: The Test Is Complete and here are the results. BTW, I just recently dropped the 15w40 out and am now going to run a 4k test with the 5w30 mineral based same brand oil with fram filter to see if that gives even better wear numbers than with the 15w40 fram combo.