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Colour of Oil

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Lobo:
Changing gear box oil today (car) and using last of year old bottle, followed by new bottle - both same manufacturer / type / spec. The new bottle however, almost clear in colour versus the older bottle @ amber. Notably both labellings identical, and state the colour as ‘Amber’
Both feel ‘slippery’ to the touch for sure.
Anything of concern here pls? Ta.

Rozabikes Tim:
Drink more water if sample on the left!

McCabe-Thiele (Ted):
Oils tend to darken over time due to oxidation the rate depends on storage condition such as temperature & how much air remains in the container plus the amount of moisture in that air.

I would expect synthetic oils to be more stable over time.

It would be interesting to know if agitation by shaking changes the colour of the sample taken as I would expect some layering to take place whist it's on the shelf.

PS Should still be okay to use.


https://en.oelcheck.com/wiki/change-in-colour/

Athame57:

--- Quote from: Rozabikes Tim on July 09, 2023, 08:49:14 AM ---Drink more water if sample on the left!

--- End quote ---
;D ;D ;D

Lobo:
Never considered shaking it Ted, but tbh drained both bottles and those colours constant in each, and no residues remaining. I’ve used this oil for 5 years now, and up until now it’s been the amber colour irrespective of length on my shelf. Interesting…

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