All joking aside, I tend to make my own semi-synth blend for my 2010 Fusion as well. My current fill, as well as my last one, is PUP 5w20, but that's because I was part of the Pennzoil study. Prior to that, I was mixing oils for my car, and they got me to 200k as well.
As a rule, I blend based on two factors:
- what time of year it is, and thus how hot/humid it is.
- what oils I have on hand
In summer, I tend to blend slightly heavier (less 5w20 and more 5w30 and/or 10w30), and in winter I tend to lean more towards 5w20.
I remember doing one fill that was in the heart of summer:
2 qts Valvoline NextGen Max-Life 5w30
2 qts Castrol SynBlend 5w20
1 qt Valvoline NextGen Conventional 5w20
1/2 quart Shell T6 5w40
While the engine specs 5w20, we regularly get up to 115+ degrees in summer, and most of my driving is highway, so I had no qualms about using that much 5w30 and even adding the 1/2 quart of 5w40. The engine loved it, and my
UOA was absolutely awesome, with just over 200k on the engine.