How Good Is QSUD SN+ At Cleaning Engine ?

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Sep 10, 2010
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Curious to learn how good is QSUD at cleaning engine internals with a standard severe duty OCI of 3,750 miles (big city suburban driving) ?
 
Has this vehicle been maintained or are you just starting with an unknown?
If the engine is new to you and shows chunks of blackness under oil fill cap or down into the valve train -not necessarily proof of a horridly filthy engine- I'd go with a Mobil1 product as they are ALWAYS praised here as good cleaning oils.

That's not to say they're the only good ones.

Here's Sis' 4.0l XJ after 150,000 miles of 5K-6K OCIs using jug dino.
 

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In a well maintained engine using 4K D1/Gen 2 rated synthetic oils since new ... **Perhaps better to phrase the question : "Does QSUD D1 / Gen 2 rated oil clean as well as other D1 / Gen 2 rated synthetic oils over a fairly benign 4K mile OCI" ?
 
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