I was just reading an article on endwrench.com advising against substituting the 4-cyl. oil filter on 6-cyl engines. Quote:
Both filters have the same physical dimensions as far as threads, O-ring, and bypass valve opening pressure (23 p.s.i.) are concerned. However, the H-4 filter has 141 square inches of filtration surface, while the H-6 filter has 201 square inches of filtration surface.
The H-4 filter should not be used on the H-6 engine. Using the H-4 filter may cause it to become contaminated faster and allow the bypass valve to open, allowing unfiltered oil to circulate through the engine.
unquote
So would it be a good idea to use the H6 filter on my H4 motor? Would oil flow be improved or time between changes?