Where do you drop oil in a Roamio fan?

Usually there is a plug type of cover under the label.

 

I see on Amazon, search "Roamio fan" and most of them have a label.

 

You could try a shot of silicone oil in the slots but I've never had any luck oiling computer fans and at best any improvement would be temporary. The needle bearing inside is only good for so long and when it's shot it gets noisy which it means that it's ready to fail completely. No fan means higher internal temperatures which will shorten the life of the processor or cause other strange problems. I don't know why you're hesitant to replace the fan but that's the best solution. You can buy 5 fans for 10 bucks on Amazon so it's not a cost issue and the job itself is very easy.

 

Do not try to open a fan. Get a new one.

 

If you need the steps to replace a fan on a basic Roamio, this may help (or not):
Where to get roamio basic or OTA cooling fan replacement

 

Hair Clipper oil is not a silicone but hair clipper oil is what I used when my premiere acted up years ago and it did the trick. I think any light oil should be fine... I was told not to use anything like WD40.

 

At the RPMs a cooling fan runs in electronics by the time you hear the fan it has gone beyond "a drop of oil" let alone a couple of years.

A Roamio OTA is a piece of cake to open with a little care and replacing the fan is EZ.
Just buy the WeaKnees fan kit off Amazon. Comes with the tools and they have a great video on how to do it.

 

OP
As mentioned by multiple people (included the post I quote), you're past a drop of oil, the repair you want to do is a fan replacement, it's the same amount of work getting to the fan to oil it would be.

 

I only used one or two drops... under a label if I remember correctly.... I think that this may help short term but as others have mentioned it’s really not a big deal to change out to a new fan and it probably has to be done at some point down the road..... good luck