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Question

I have been told me that on the Subaru Impreza the oil drain plug crush gasket needs to be replaced with every oil change and that when properly tightened acts similarly to a lock washer. He stated further that the oil drain plug crush casket is only effective as a Lock washer" one time and if not replaced becomes ineffective and the oil drain plug can loosen and fall out. Is this correct?

Submitted: 456 days and 18 hours ago.
Category: Car
Value: $15
Status: CLOSED
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2005 Subaru Impreza

Posted by Dr. Hamman 456 days and 18 hours ago.

Answer

Hi, I will do my best to assist you. When you are finished please click on accept. I don't get paid unless you do. I don't know if you are a pro or a novice so we may have to fine tune the answer.

In a perfect text book correct world yes all of this is correct. But in the real world these are rarely replaced, and do not have a problem if they are reused. The drain doesn't have a problem with vibrating loose if tightened properly. This practice is mostly to help sell parts and not because it is necessary. If you have any more questions I am here to help. Good luck, and Thanks for using Just Answer.

I hope this helps, 100% satisfaction is my goal. If the answer is not clear, please reply and I will assist you more. When you're satisfied, click on accept. I don't get paid unless you do. A bonus and positive feedback are always appreciated, good luck and Thanks.

455 days and 23 hours ago.

Reply

I didn't word my question very well. The oil drain plug actually fell out of my daughter's Subaru Impreza causing extensive engine damage. The receipt from the place that did the oil change does not show that the crush gasket was replaced. We were told by the service rep at the dealership where the engine was repaired that the oil drain plug crush gasket needs to be replaced with every oil change and that when properly tightened cannot back out, that it is only effective one time, and if not changed can loosen and fall out. In this case the drain plug fell out after nearly 5,000 miles, but according to another source that should not matter.

Accepted Answer

The crush gasket not being replaced would not cause the drain plug to fall out. Bottom line is if the drain plug fell out even after 5,000 miles it was not properly tightened when it was last installed. Whoever installed the drain plug should be liable for any damages. If you have any more questions I am here to help. Good luck, and Thanks for using Just Answer.

I hope this helps, 100% satisfaction is my goal. If the answer is not clear, please reply and I will assist you more. When you're satisfied, click on accept. I don't get paid unless you do. A bonus and positive feedback are always appreciated, good luck and Thanks.

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Expert: Dr. Hamman
Pos. Feedback: 99.3 %
Accepts: 
Answered: 8/24/2008

Automotive Engineer

30 years experience, Repairing, building, & designing, automobiles.

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