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Originally Posted by page62
I just made the switch to 15w40, too. It seems to be what Mercedes originally recommended in the owner's manual. I'm using the Carquest "house" brand, which is made by Valvoline.
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have also used valvoline 15/40 'all fleet' in my engine with good success.
it is also diesel rated.
lately though the delo and delvac have been used mainly due to easy availabilty at wal-mart
