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Message: [QUOTE="bismic, post: 1565946, member: 1537"] Thanks! Lots of middle o-ring failures on standpipes. It is my opinion that Ford went to a different supplier - just like they have done on the oil coolers (China based for cost savings). I have the earliest version of Ford's upgraded standpipes on my 2006 (updated them in 2010 or so. They are solid! I won't ever get rid of them, I will just put new o-rings on them if/when they decide to leak. Part of the issue w/ Ford's cheaper versions (and I wish I knew [I][B]when[/B][/I] they changed suppliers, but I don't) is the design, but also it seems that a cheaper o-ring material was used. Getting the Alliant o-ring set for standpipes is probably a decent bet for getting the proper material in these o-rings. Now, all that said, DieselSite noticed the change/decline in Standpipe quality some time back, and they came out with their upgraded version. It did not fair very well, and I think it is because [U]they[/U] did not take o-ring material and specifications seriously enough in their first try. They now have a second version and for that version it specifically touts the proper material and durometer hardness. I wouldn't have an issue with trying those, but I have not seen them "pass the test of time" quite yet. O-ring and gasket material is one of the first things that is "skimped on" when aftermarket companies start producing replacement parts "for cheap". Definitely China parts will have cheap "soft goods" unless they are held to a contract to include the better materials (and even then someone had better be periodically auditing and inspecting them)! JMHO Then you see a LOT of Dorman junk installed - just a matter of time with their parts! [URL unfurl="true"]https://www.dieselsite.com/2004.5-2010dieselsite60lstandpipes.aspx[/URL] I guess the last thing to add, is that I have gone to using a "silicone oil" for o-rings from Parker instead of oil for pre-lubing the standpipe o-rings. Called Parker Super o-Lube. It is thicker and IMO does a better job in protecting the o-rings on installation. Some people say that Silicone grease will work also. [URL unfurl="true"]https://ph.parker.com/us/en/product-list/high-viscosity-silicone-lubricant-general-purpose-and-high-pressure-pneumatic-translucent-super-o-lube[/URL] [/QUOTE]