The Volvo Parts, Accessories &
Performance Specialists Since 1963

Oil Filter Separator Box Diaphragm

Aftermarket - 140064

Item Number
Brand Classification
Units Per Car
One Year Parts Warranty
Country of Origin
Product Group
Repair & maintenance
OE References
Genuine Volvo - 31338685, 30684381, 30788494, 31338684

Product Description

This is the cute little diaphragm that goes inside the oil seperator/breather box assembly on very early P1 cars. When this diaphragm is compromised or torn it results in the famous "idle squeal of death" while stuck in daily traffic.

This diaphragm fits original oil seperator boxes used on engines up to -3285661.


There was a chassis break early in the P1 cars but any cars that have had PCV dealer service are likely updated to the later style. If your early car has been updated to the later style box it will be indicated by later part number 31338685 on the top cover. if your early car has been updated it will use 140065 instead.

Potential Product Fitment Issues

This diaphragm fits original oil seperator boxes used on engines up to -3285661. This is most easily identified by checking for the electrical connector on the box for the heater element. The early oil separator box did not have a heater element. The later box (or cars that have been updated) has an electrical connector which may , or may not be wired to the engine harness.

About Aftermarket

At IPD, we have a basket of trusted "Aftermarket" brands we pull from for fast-moving items, so we're able to get customers the right part for the job from any available source. Our Aftermarket brand umbrella covers many brands you're familiar with, like: APA ÜRO, CRP, Rein, TYC, Professional Parts Sweden, MTC, Fel-Pro, FAE, KAE-Kaehler, Fram, ProTech, Nissens, Standard Ignition Products, Centric, Beck/Arnley, and more!

We pick brands with a balance of good quality and good value; we trust these brands on our own cars, and we hope you will too!

Show me more products from Aftermarket

Vehicle Fitment Guide

Shipping Estimate

Product Reviews

Policies, Warranty & FAQ