Originally Posted by SDM1
The filters you both mentioned should be the same for my 2011 Aspire with Frieghtliner chassi i hope! So far i have not been able to find the water separator filter for my ISL 400. These numbers are for Fleetguard correct?
Nothing like being late to answer a post.
The water filter is right in front of the oil filter if your 400 has one. They are a real pain to get to and easier if the oil filter is out. The the older filter has a plastic shut off valve, I HOPE they have changed that to metal. If it has the plastic shut off valve don't use it, it will break. The heat caused them to crumble if you try to use it.. It is much cheaper to loose a little antifreeze on the floor that to replace the shutoff....that is almost impossible to get to. Been there not once but twice.
If the new 450's still take additives, I will add it to the radiator rather than the pre-charged filters. That is one filter I will let Speedco replace next time. Thankfully they don't need changing very often if you test strip comes out good.