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98 ML320& 05 ML350SE
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147 Posts
Discussion Starter #1
What if anything of consequence other than thinning out the viscosity happens when you add say 5/30W Mobil 1 to a ML that is filled with 20/50W Mobil 1??

If it is a 50/50 proportion, do you end up with a 10/40W equivelent weight oil??
 

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'05 ML350SE
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1,395 Posts
Topping off with a different grade is not considered
a problem. However, a 50-50 mix is a different story.
I suggest you put the question to Mobil.
 
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