I have a 2007 12.5 KW Westerbeke BTDB genset.* Westerbeke recommends that I use only Westerbeke branded oil filters--model 36918 which cost about $12-14 each.* I see that the Wix*51334 or the Napa 1334 filter*can replace the Westerbeke filter at about 1/3 the price.* What does the group think about the Wix and Napa filters and should I have any concern about going the cheaper route?* Thanks*