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Reply to "Are Viscosity Index Improver Polymers all that bad?"

Hi
i have one problem regarding polymer behaviour in diesel& petrol engine. same polymer is used in diesel & petrol engine oil, but its working fine in petrol engine whereas in diesel engine, its gets jammed at fuel injector & resulting in deposition of soot at diesel injector & malfuctioning fuelcalibration.
what is micron size of filters used in diesel & petrol engines ( i guess diesel engine being a large engine mesh size may be big), please guide
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