This kit comes with everything needed to properly supply your Holset HE200/HE211/HE221/HE250 with oil from your OM617. This kit contains:


-36" or 38.5" -4AN stainless, braided, Fragola line, custom made, with additional external protective coating. 90's on each end.

-M14x1.5 to -4AN oil filter adapter fitting with crush washer

-M10x1.25 to -4AN oil restrictor orifice turbo adapter fitting


I have the oil lines custom made by Fragola; you can't buy these anywhere else. These are the highest quality aftermarket lines you can buy, made proudly in the USA. The 36" works with the OEM OM617 oil filter housing. The 38.5" works with the Doomsday Oil Filter Relocator.


The Holset turbos have a tolerant operating range when it comes to supply-oil, however, you must be within the outlined ranges, or you could blow oil past the inner seals, causing oil to either go into your intake, out your exhaust, or both. This presents the potential for a fire. Not enough oil will starve your turbo, wiping out your turbo bearings. The OM617 produces more oil pressure than most engines I've encoutnered. It can easily hit 110psi at cold startup and 100psi even when hot.


Restrictor Orifice vs. Pressure Regulator

What's the difference?


-A pressure regulator (PR) only bleeds off a very small amount (volume) of oil to reduce pressure. You set the peak pressure limit - it only allows up to that pressure to flow. It doesn't affect the bottom-end when idling hot. PR's have gauges so you can see what pressure you're actually feeding your turbo. They deliever much more volume (2.5x as much volume in the testing I did). But they require a bypass drain. And, they're quite expensive by the time you source all the components. To sumamrize - they're more expensive, have more parts to potentially fail, but supply a lot more volume.


-A restrictor orifice (RO) is a small hole of a specific diameter that reduces pressure AND flow. It is literally as simple as putting this "diameter" somehwere in your oil feed line. It's easy to kill 2 birds with 1 stone and make the turbo fitting double as your AN adapter, as well as your RO. It's cheap. The major problem is: You have to set up and perform some sophisticated testing to know what diameter to run. Not only must you measure your pressure drop, but you must measure flow, as well.


I've done all this testing myself. The PR that I endorse flows 2.5x the volume of Holset's minimum requirement at over 7 Lpm. The RO still flows the required volume at just over 2.5 Lpm. It could be argued that the PR will give your turbo a longer life with that much more volume flowing by helping to cool the turbo better. The PR gets set to the maximum allowable pressure - so that's a no-brainer. For the RO, I tested several different sizes. I found a range of sizes that will work. I tested both high-pressure and low-pressure to account for all OM617's, whether they're worn out or like-new. I also tested at idle and at high RPM. The end result is an RO that meets all of the minimum and maximum requirements. It's literally as simple as "knowing what diameter to drill your restirctor out to". However, the amount of work required to determine that diameter is exceptional. Therefore, I will not share the diameter. Your RO will arrive to you with the proper size, ready to be installed. The RO is not for individual sale.

OM617 HE2xx Holset Turbo Oil Feed Line