Totta, suodattimia on erilaisia ja myös eri by-pass venttiiliin paineille. Luetteloista löytyy arvoja 8- 14 psi:n paineille, mutta jonkin tiedon mukaan jopa saman valmistajan suodattimen by-pass venttiilien aukeamispaineissa on eroja, venttiilit eivät ole mitään tarkkuustyötä...
Lainaus: "These valves are set to trigger if the filter element is making too large a pressure drop. Normally, this would be because it is clogged, however on an engine with a very high flow oil pump this can also happen if the oil is very cold. Motorcycles do not have high- flow oil pumps. These relief valves are set for different pressures, and sometimes a tech or mechanic will tell you that it's important that the relief valve have the correct rating. It's not. These valves are very low-precision devices, and their pop- off values are different from each other even in identical filters of the same brand."