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Who Has Disabled MDS on a 5.7L and Swapped To 5w30?
I disabled MDS on my 2013 125k mile 5.7L and not going to re-enable it.
My oil analysis iron levels are great. I'm under the impression the 5w20 is proprietary for MDS to function well.

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I disabled MDS but continue to use 5w20 full synthetic due to the VCT (variable cam timing) ... also referred to as VVT (variable valve timing). The VCT uses a variable control valve to direct oil pressure into the camshaft phaser assembly. The camshaft phaser assembly advances and/or retards camshaft timing. I don't know if the VCT is as sensitive to oil type as the MDS but I stayed with 5w20 ... just in case it is.
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