I under stand that there must be a restriction somewhere so is it in the filter housing itself or in the lines,I just put any lines I could find when I put the filter on my 235 and wondering if that could be why the crank is scored and bearings down to copper with around 15,000 miles on it. Its time to change the oil and might eliminate the filter since the damage is done and will look into the correct lines before installing the replacement 235.