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Best Automotive Replacement Ventilation Breathers

JEGS Performance Products 52205 Air Oil Separator
Designed for vehicles with positive crankcase ventilation systems, this air oil separator prevents oil blow-by from being displaced into the intake tract on engines where crankcase pressure is high, such as high RPM applications. Enter your model number to make sure this fits.
Reviews
"Ended up finding at Lowes some nipples that are for natural gas and they were perfect."
"especially for a ford mod motor or chevy LS (these engines have a decent amount of blow by factory)."
"After having been installed for about 6 months, there is a touch of oil in each bulb, so whatever it does is working."
"Installed between my engine and carb."
"I installed this on my Cadillac CTS to try to reduce valve carboning due to ingesting oil (this is a common problem on direct injection motors)."
"The head has no threads for the machine screws that are used for the included mount..."
"although this did not fix the problem, it does keep a good deal of oil out of my intake system and out of my exhaust."
"The main problem I had with mine was the holes on the top that the bracket is supposed to bolt to but wasn't even threaded."
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URO Parts (078 103 224R) Breather Hose
Every RO part undergoes one or more of the following measures inorder to make certain that each part meets or exceeds OE standardsfor fitment, function, durability, and designInstallation and use of the part in real world conditionsfor. Enter your model number to make sure this fits.
Reviews
"While replacing this tubing you should also buy part number 078 103 223B which is the breather hose that goes from this part to the crank case under the mass air flow. I also bought the suction pump (part number 058 133 753 D) at the same time I purchased this URO breather hose in the Dorman brand of their part number 911-400 which seemed of good quality."
"One of the bends were a little off but no big deal."
"Installation of the new part is easier that removal of the old brittle part."
"Be carful putting in on the back side I broke the old tube and had to piece it together with a radiator hose."
"fits just like the stock one did,great fit."
"Great quality fast shipping."
"This piece was a very tight fit 99 Audi A6."
"My experience is exactly as another reviewer noted - "This tubing was not bent at the correct angle, and thus caused extra stress on the plastic to get it to fit ...I fear that this stress on the part will cause it to crack or break prematurely."."
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Dorman 48006 PCV Breather Hose for Volkswagen
PCV Hoses allow crankcase pressure to escape the engine in a controlled manor. Constructed of high quality materials for long lasting use.
Reviews
"Had an engine warning lamp on my VW Passat that was very difficult to diagnose."
"It works and its a good price."
"Fast shipment, easy install, great replacement for the OEM version on my 2008 Audi A4 B7 Avant."
"Fit perfectly."
"Perfect fit for 2006 Audi A3."
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Best Automotive Replacement Ventilation Filters

Fleetguard CV52001 Crankcase Filter
Primary Applications CUMMINS 4936636 All Applications Replaces CV52000 - Product Comments OCV Breather Assembly used on Cummins ISB6.7 engines 2007 up. Enter your model number to make sure this fits.
Reviews
"I decided to do the ccv filter delete and see how it turns out so i dont have to ever worry about replacing this filter."
"My mileage was 41k at the time and the recommended interval is 67k or so (yes an odd number), but I tow heavy and for the price, it was good insurance to lessen the chance of fouling up my turbo."
"Used this when my existing filter became soaked with oil."
"I thought it was time to change mine, I needed one, this one fits as suggested and it was cheaper through Amazon than the dealer."
"Works great, fit just like OEM, priced right."
"I installed it in under ten minutes and I had to go back and forth to my shed from my street to the back of my lot to get tools a couple times."
"Just don't drop the screws at the back and take your time wiggling the wire at the back off the stud."
"Saved alot of money by putting. This in instead of the dealer doing it!"
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Best Automotive Replacement Ventilation Grommets

Dorman HELP! 42062 PCV Valve Grommet
Dorman Products, Inc. is well-known as a leader in providing quality auto parts to the aftermarket. Enter your model number to make sure this fits.
Reviews
"My 89 Corvette has aluminum valve covers and the groove on this grommet is not wide enough to fit properly into the valve cover."
"Works great and is factory correct on my 1979 Corvette for the PCV valve."
"Fit nice on 94 Chevy 5.7L."
"Perfect fit."
"Install with the flat side on the top of the valve cover, with the straight edge pointing down toward the manifold."
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Best Automotive Replacement PCV Valves

Dorman 917-064 PCV Diaphragm Repair Kit for Volkswagen
Save time, money and labor with Dorman's PCV Valve Diaphragm. This part has undergone a rigorous inspection to ensure high quality.
Reviews
"Cleared the code (which for some reason makes the engine sound like it's going to die) and waited a few minutes. Shut the engine off, paused, restarted the engine and got P0300, P0301, P0302, P0303, P0304 engine codes."
"A refund or the second part I paid for would be nice... Update: Changing to 3 stars."
"After a couple of YouTube videos suggesting that some folks still had leaks after replacing this Dorman part, I expected they had damaged the manifold itself when removing this cap."
"My only downgrade is that this part differed from original in that the flexible membrane was attached to the valve body on the original and this replacement is not."
"spring just wasnt right (honestly forget if it was too strong or weak but a quick search online will confirm they all are like this) so just make sure to reuse your old spring if you try this and it doesnt quite work right, try the old spring before deciding part is bad."
"I replaced this on a 2011 vw jetta 2.5L had a p2178 rich condition bank one on idle."
"I did get a check engine light and code for running too lean in the first mile or two after installation, but I think the rubber just needed to get heated up and broken in."
"It lasted approximately 5 months then the car started throwing a check engine light."
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