Which one?

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Which one? Mobile ESP 5w30 has a sulphated ash of .6. 0w40 has .8. Do I sacrifice the better ash for a thicker oil in the summer? I do not understand most of the other specs, so any help would be appreciated. Roger

2010 Mercedes R350 Bluetec diesel requiring 229.51
 
I don't think either of them have a ridiculously high sulphated ash content.

I think either one would be fine.
 
Honestly, I would use whichever costs the least. Both are excellent oils for your car and rated for 229.51.
 
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