Having to do this a second time, the original 6 hour process (involving the loss of 2 sockets and having to go buy some new ones to remove the IM and get them back) was shortened to 2 hours in total. I found that the thing that helped MOST was buying the deep socket and wrench set.
This article discusses in detail the engine oil used in Mazda 6 cars: 1st generation Specifications for diesel models: API - CF, 5.2 / 0.21: 4.9 / 0.2
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mazda 6 2.0 diesel forum