Esters in 0W-30 German Castrol

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8,467
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Colorado
Some people believe that there is a lot of ester in the German 0W-30 Castrol, because of the low pour point. Assuming that there is a lot of ester, how would this affect cleaners like Auto-RX and Neutra? Assuming that you will be unable to find the German Castrol (quite likely), how does Mobil 1 0W-40 compare with it?
 
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