WerdnaR

Let it lie here for a bit: And the single reply as of 7.30.2025:

Got the same low oil pressure issue with my Seat Leon 1p1 CBZB engine and found this lovely forum while google-digging. Sharing some details: 03C 115 561 H - VW part number for oil filter MANN-FILTER W 712/94 - Original OEM manufacturer filter https://www.mann-filter.com/uk-en/catalogue/search-results/product.html/w712/94_mann-filter.html Bosch part: Part number: F 026 407 183 Trade number: P7183 https://www.boschaftermarket.com/gb/en/parts/-/Details_of_Oil_filter_spin-on_box_for_vehicle_Seat_Leon_1.2_TSI_2010_-_2012_77kW_CBZB/pi/categories/Filters/products/F026407183/vi/vehicle/ARNoLpf/ If you open oil filter details in Bosch catalog by the link below, then click on filter image - image gallery will appear and surprisingly it contains both old (silver) and new (black) filters: It seems the old one Bosh filter is MANN-FILTER W 712/94 while new one (per shape, construction and printing style) seems a PURFLUX LS391A https://www.purfluxgroupcatalog.com/catalogues/FO/scripts/cat_fich_filtre.php?zone=FR&catalogue=PFX&lang=GB&ref_filtre=LS391A Difference is that MANN filter has more soft, more thick and removable rubber valve at the top of plastic part, while PURFLUX has more rigid and thin layer of rubber hardly mounted (glued?) on plastic part. Also metal spring under the plastic in MANN filter is 2 times bigger and more strong. Seems the root cause of low oil pressure is: Rubber valve construction & because of that valve difference using recommended by PURFLUX fitting procedure (ie tight till rubber sealing touches the gasket and then additionally rotate to 270 degrees) results that thick and rigid valve rubber just got damaged by the edge of oil channel. Workaround (if you unfortunately got Purflux-style filter): Just remove plastic valve, spring (under the valve) and rubber sealing ring from your new PURFLUX-style filter and replace them by the parts from your old MANN-style filter - the mount is the same and parts appears to be compatible. Also I would recommend to put an oil on valve rubber as well as on sealing prior to fitting a filter so that it will better slide on oil channel edge during the final tightening. Works good for me (but next time I'll order MANN's one ;) ). PS: apologies for my non-native English.