Are aluminium oil filler caps safe?

[IM-32-FK]

I want to get those fake replica nismo aluminium oil filler caps from eBay but I’m a bit weary on them. Do you think they can hold up to the oil pressure from engine? I mean if oil pressure gets high enough wouldn’t it start leaking or even worse, blow straight off? There’s also the problem of threading when putting it on and off.

its just purely for asesthic reasons why I want one but I’d like to hear some thoughts and opinions on them

thanks

[Ben C34]

Considering the oil under pressure has nothing to do with the oil cap, the only pressure will be caused by blow by and will be a few psi at most, yes they are safe.

[jmknights93]

Oil pressure popping an oil cap off? Well, that's a new one... The only problem I see with alloy caps are the fact that they get bloody hot!

[Ben C34]

Take the cap off a running engine. Oil doest come shooting out

[tridentt150v]

And considering that the original cap is plastic...……..well how much pressure do you think plastic would take in comparison to alloy?

I've got a half piston type anodised blue one with Tomei on it, and its harder to undo than the factory one cos there is no grip on it.  Sometimes I have to use a screwdriver in the fake gudgeon pin hole to start it.  I always tell myself that one day I will dig the factory cap out and use it, but I never seem to....maybe its the bling?

 

[WantGTR]

I have an eBay one. Its fine. Don't over think it. 

[IM-32-FK]

Is the correct dimension 6cm diameter , 3.1cm height and 32mm thread 

or

5.7cm diameter, 3.2 height and 32mm thread

 

thanks it’s for rb25det neo

Edited September 19, 2019 by IM-32-FK

[iruvyouskyrine]

16 hours ago, Ben C34 said:

Take the cap off a running engine. Oil doest come shooting out

instructions unclear, dick stuck under camshaft, please advise next step

 

[Ben C34]

1 hour ago, iruvyouskyrine said:

instructions unclear, dick stuck under camshaft, please advise next step

 

im on my way