Changed my mother's oil filter today on her 98 3.8 Monte Carlo. Put on a new Purolator L10111 filter and cut the old one open and I immediately noticed it had cardboard endcaps instead of the metal ones associated with the Purolator Premimum plus filters. The filter seemed to be well made, however the cardboard endcaps might make me change by mind and use the Bosch filters from now on.