---
product_id: 532676077
title: "Engine PCV Box Oil Separator Diaphragm with Spring Compatible with S40 V50 C70 Code p0174 p0171 Replace 30684381 30788494 31338684 31338685"
brand: "lenmiso"
price: "$21.27"
currency: USD
in_stock: true
reviews_count: 8
category: "Lenmiso"
url: https://www.desertcart.us/products/532676077-engine-pcv-box-oil-separator-diaphragm-with-spring-compatible-s40
store_origin: US
region: United States of America
---

# Perfect OEM fitment Easy, quick installation Durable ABS plastic build Engine PCV Box Oil Separator Diaphragm with Spring Compatible with S40 V50 C70 Code p0174 p0171 Replace 30684381 30788494 31338684 31338685

**Brand:** lenmiso
**Price:** $21.27
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your Volvo’s heart with precision-engineered reliability!

## Quick Answers

- **What is this?** Engine PCV Box Oil Separator Diaphragm with Spring Compatible with S40 V50 C70 Code p0174 p0171 Replace 30684381 30788494 31338684 31338685 by lenmiso
- **How much does it cost?** $21.27 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/532676077-engine-pcv-box-oil-separator-diaphragm-with-spring-compatible-s40)

## Best For

- lenmiso enthusiasts

## Why This Product

- Trusted lenmiso brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Compatibility:** Specifically designed to fit a wide range of Volvo five-cylinder models from 2004 to 2016, guaranteeing a perfect match every time.
- • **Effortless Installation:** Manufactured to original equipment standards for a straightforward, no-fuss replacement that saves you time and hassle.
- • **Trusted by Volvo Owners:** Highly rated by users who experienced immediate performance improvements and peace of mind after installation.
- • **Engineered for Precision:** Crafted from high-grade ABS plastic to resist deformation and leaks, ensuring long-lasting durability.
- • **Restore Engine Efficiency:** Eliminates PCV system issues like vacuum leaks and oil contamination, helping your engine run smoother and cleaner.

## Overview

The LENMISO Engine PCV Box Oil Separator Diaphragm is a durable, ABS plastic replacement part designed to perfectly fit multiple Volvo five-cylinder models (2004-2016). It prevents oil leaks and vacuum issues by maintaining proper PCV system function. Easy to install and built to OEM standards, this diaphragm restores engine efficiency and reliability, making it a must-have for Volvo owners seeking hassle-free maintenance and performance.

## Description

Rating: - reviews. Buy LENMISO Engine PCV Box Oil Separator Diaphragm with Spring Compatible with S40 V50 C70 Code p0174 p0171 Replace 30684381 30788494 31338684 31338685 on desertcart.com and confirm correct fitment online.

Review: Fits as advertised - Perfect fit for a 2016 Volvo XC60 Solved my issue
Review: Fixed 2006 Volvo V50 T5 AWD - My son’s V50 was howling and stopped when I took off the oil filler cap. Pulling super strong suction through oil filler. Read that these diaphrams go bad and need replacing. Pulled air box to the side and popped off with stiff putty knife getting leverage on oil filter cap. Reused original cap but this replacement looked exact same. Lubed the lip of the PCV body with petroleum jelly and carefully positioned in place with the notch lined up and pressed down with 1/2 ratchet wrench levered off engine tab. It seated all the way round and totally fixed problem. Time will tell how long it lasts. I’m happy with purchase.

## Features

- Condition: Engine Oil Separator Diaphragm Kit, Made of durable ABS plastic for a tight fit and resistance to deformation, leakage and break proof to ensure service life.
- Part Number: 30684381, 30788494, 31338684, 31338685. Please check the part number and picture to ensure fitment.
- Compatible with Volvo Five cylinder: C30 2.4l 2007-2011; C30 2.5l Turbo 2007-2013; C70 2.4l 2006, 2007; C70 2.5l Turbo 2006-2013; S40 2.4l 2004-2010; S40 2.5l Turbo 2004-2012; S60 2.5l Turbo 2011-2016; S60 Inscription 2.5l Turbo 2016; V50 2.4l 2005-2010; V50 2.5l Turbo 2004-2012; V60 2.5l Turbo 2014-2016; V60 Cross Country 2.5l Turbo 2015, 2016; XC60 2.5l Turbo 2015, 2016; XC70 2.5l Turbo 2016.
- Perfect fit: Oil Separator diaphragm is perfectly matched with the original car model.
- Easy to install: It is strictly manufactured to meet the original standards and perfectly replace the old or damaged one.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #330,441 in Automotive ( See Top 100 in Automotive ) #656 in Automotive Replacement PCV Valves |
| Customer Reviews | 4.0 out of 5 stars 40 Reviews |

## Images

![Engine PCV Box Oil Separator Diaphragm with Spring Compatible with S40 V50 C70 Code p0174 p0171 Replace 30684381 30788494 31338684 31338685 - Image 1](https://m.media-amazon.com/images/I/51AMnVa3nFL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fits as advertised
*by D***O on August 25, 2025*

Perfect fit for a 2016 Volvo XC60 Solved my issue

### ⭐⭐⭐⭐⭐ Fixed 2006 Volvo V50 T5 AWD
*by S***K on December 16, 2023*

My son’s V50 was howling and stopped when I took off the oil filler cap. Pulling super strong suction through oil filler. Read that these diaphrams go bad and need replacing. Pulled air box to the side and popped off with stiff putty knife getting leverage on oil filter cap. Reused original cap but this replacement looked exact same. Lubed the lip of the PCV body with petroleum jelly and carefully positioned in place with the notch lined up and pressed down with 1/2 ratchet wrench levered off engine tab. It seated all the way round and totally fixed problem. Time will tell how long it lasts. I’m happy with purchase.

### ⭐ Looked good, fit not so!
*by D***L on September 2, 2024*

The part arrived on time, however, that is the only good thing. When the part arrived, I inspected the part which appeared to be identical at first glance. When I held the new PCV cover up to the original PCV cover, I noticed that the outer diameter of the New PCV cover was noticeably larger than the original. Inspecting the diaphragm in the new Cover, it appeared that it was slighter smaller, and less robust than the original diaphragm. I went for it anyway to install, since my original cover had a crack. Immediately as it tried to press the cover on, it was obvious that the new cover was not going to stay in place as it was slightly too large. Not sure what is going on with quality control, but this did not work on my T5 Volvo. YES IT DID look the same at first glance when I opened the package...this one is going back regrettably as it would have been a great deal if it fit!

## Frequently Bought Together

- LENMISO Engine PCV Box Oil Separator Diaphragm with Spring Compatible with S40 V50 C70 Code p0174 p0171 Replace 30684381 30788494 31338684 31338685
- X AUTOHAUX Valve Oil Filter Diaphragm 31338685 for Volvo C30 2007-2013, S40 2004-2011, C70 2006-2013
- Bosch Oil Filter - 3480

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-20*