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Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit
Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit
Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit
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Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit

Marsoni M251S
Sale price$213.72
Pay 4 payments of $53.43 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Radium Engineering 2015+ Subaru STi Air Oil Separator-Return KitThe Radium air oil separator traps blow by oil before it can be sent back to the induction system. The collected oil is heated by the AOS to remove moisture, then allowed to drain back into the engine block, making this a zero maintenance system. Installation is done using factory mounting points. All required hardware, hoses and other items are included in the kit. This Part Fits: Year Make Model Submodel 2015 2020 Subaru WRX STI Base 2015 Subaru WRX
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Your Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit orders ship within 1-2 business days.

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  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 2347 reviews
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Verified Purchase
NorthFloridaLT
Pawtucket, US
★★★★★ 5
Made My Bumper Look Brand New Again
Size: TRIM COAT KIT, Size: TRIM COAT KIT
I used this on the plastic trim and bumper on my truck, and I’m honestly impressed with how it turned out. The faded areas came back to a deep, rich black and really cleaned up the whole look of the rear end. I prepped everything the right way by washing it first with an all purpose cleaner, then wiping it down with 91% alcohol. I also taped off the surrounding paint and chrome just to be safe. After that, the application was simple and went on smooth without any streaks or blotchy spots. The difference was immediate. What used to look dull and worn now looks factory-fresh again. It also seems to bond well and not just sit on the surface like some cheaper products I’ve tried before. Overall, this was easy to use, gave great results, and made a noticeable improvement. I would definitely use it again on other trim pieces.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 12, 2026
E
Verified Purchase
E N.
Birmingham, US
★★★★★ 4
Good product
Size: TRIM COAT KIT
Good coverage. I've had it on for about 10 days, and it's holding up better than any spray product I've used. Not perfect, but none of those streak lines you get with other products. It's been rained on twice so far.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
E
Verified Purchase
ernieupton
Alexandria, US
★★★★★ 5
good product and value
Size: TRIM COAT KIT
worked great on the 10yr old outback. Lasted several months..until we traded it in for a new outback.. will find something else to use it on...!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 20, 2026
M
Verified Purchase
Miles Blum
Los Angeles, US
★★★★★ 5
Great product and easy application
Size: TRIM COAT KIT, Size: TRIM COAT KIT
This stuff is awesome. It’s very easy to apply, just make sure the plastic application area is clean but don’t worry about taking too much time to clean the area as long as it’s clean and dry. Made my ‘19 Pilot look brand new.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
S
Verified Purchase
Samdelok7913😀
Dallas, US
★★★★★ 5
glossy finish for faded black plastics
Size: TRIM COAT KIT
I have already used this product before and the results were very nice. If you don't mind a glossy finish, this product will bring those old black plastics back to life. You get several mess free applicators in the box. The product dries quickly and will last about a year or so, in my experience.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 20, 2026

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