As per the Fleetguard rep, he said that the stratapore filter is desgined for the 24v. The case is thicker and the stratapore filter will take high pressure that the 24v puts out over the 12v. It is listed as the filter for 24v as the microglass is listed for the 12v engines. You can use the stratapore on the 12v but can not use the microglass on the 24v do to the oil pressure difference. I was told this several years ago. Call Fleetguard and see what they say.