Personally I use Ravenol VMO that I buy online from Blauparts that is made in Germany, IMO the best I have ever run in my turbo 4 cyl VW engines and get almost zero burn off in my 2.0T over 5K miles changes and I am now at 150K.
I am getting great results with the Ravenol VMO 5w40 in my 08 2.0 TSI, almost no burn off in 5K change and area below oil fill in valve cover is spotless. Used to have a dark color oil film at change interval but after 4 changes with the Ravenol it is clean oil film now at change.
In my VW's I do 5K oil/filter change just to be safe and always use VW spec oil. I do not have analysis done on my used oil, it may go farther but $50 for Ravenol VMO 5w40 and OEM filter is a lot cheaper than an engine rebuild.
I am using the Ravenol for last 3 changes, oil consumption at 5K change intervals is less than 1/2 quart (about 1/4 qt on last change) and hoping this may lead to less carbon build up.
They should be using 0W20 full synthetic oil (not synblend crap). Its not going to hurt running the 5W20 in it instead but next time mention it at write up. Mazda claims benefits such as better cold start protection and better efficiency among other things.
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