I cant believe why psa has a fine extra filter before the turbo
Because the filtered out contaminants will block the oilflow
The normal oilfilter will take care of oilfiltering and has lots more margin for dirt pickup and still enough oilflow
Besides many other engines dont have the turbo filter either and function perfectly
Best is to leave the turbo oilfilter out AND lower the oildrain interval substantialy below psa recommendations to prevent sludge buildup
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