Do I really need to use a special oil in the tube is there any other oils that will serve the purpose?

Maybe I have something in my workshop already

Any oil will do.

I was hoping to hear those words. Make sense. Thanks

The original struts used special oil. Aftermarket strut insert replacements don't need any oil. Not sure what you're working on.

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https://www.classiczcars.com/settings/

A little doesn’t hurt to prevent rust in the tube.

I'm installing new KYB's

I like the idea of a light coating of lube on the inner walls.

KYB is pretty specific about using no oil, but many people (including me) defy that recommendation and use some anyway.

Since you aren't using the oil primarily for lubrication, but instead, more for rust prevention, I would recommend an R&O oil. That means "Rust and Oxidation". R&O oils have additives intended to minimize R&O. Here's a couple links for info:

https://www.valvolineglobal.com/en/r-and-o-oils/
https://www.phillips66lubricants.com/product/multipurpose-r-o-oil-mining/

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On 11/20/2025 at 6:25 PM, Captain Obvious said:

KYB is pretty specific about using no oil, but many people (including me) defy that recommendation and use some anyway.

Since you aren't using the oil primarily for lubrication, but instead, more for rust prevention, I would recommend an R&O oil. That means "Rust and Oxidation". R&O oils have additives intended to minimize R&O. Here's a couple links for info:

https://www.valvolineglobal.com/en/r-and-o-oils/ https://spinfever.online/
https://www.phillips66lubricants.com/product/multipurpose-r-o-oil-mining/

What kind of results have you seen from using R&O oil despite KYB's recommendation? Have you noticed any difference in shock longevity or ease of removal compared to installing them completely dry?

Edited June 8Jun 8 by devidevighst

3 hours ago, devidevighst said:

What kind of results have you seen from using R&O oil despite KYB's recommendation?

I (thankfully) have not had to go back into my struts since I put the KYBs in. I'm actually kinda hoping I never have to go back in. But if I do, I'll be sure to post my findings.

That's a classic Z-car maintenance question. For the front strut housings (the tubes where the strut inserts go), you generally want to use a bit of clean engine oil or lightweight gear oil just to displace moisture and prevent the insert from rusting or seizing inside the tube. You don't need a lot—just enough to coat the inside walls or bottom before dropping the cartridge in.

Has anyone here experimented with anti-seize instead of oil, or does a light film of oil still hold up best over the long run without making a mess during future changes?

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Edited August 10Aug 10 by rex_morten

5 hours ago, rex_morten said:

That's a classic Z-car maintenance question.

Classic Z-car question or classic maintenance question?