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I don't want an MK4!
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1,725 Posts
Discussion Starter #1
I have some unopened Amsoil Synthetic. It is about 5 years old.

Should I use it?

bobistheoilguy site is a pain to register on.

Any thoughts. The internet seems very unsure of a consistent answer.

Thanks,

Dan
 

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34 Posts
Opened oil goes bad due to moisture. sealed, IDK.
Dissolved Moisture
Dissolved moisture is the lowest level of moisture contamination in lubricant oils. This moisture is derived from ambient air humidity slowly interacting with the lubricant oil overtime. Usually, the more additives the oil contains, the more hygroscopic (water attracting) the oil will become. Acceptable levels of dissolved moisture typically range from 50-300 ppm (or 0.0050% – 0.0300%). [2] This level of moisture does not greatly affect the compressibility or viscosity of the oil but is the most chemically reactive water species since it is dispersed throughout the oil.
The bottom line:
Dissolved water can degrade metal and deplete additives
 

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Moderator, l337 M0d3r4t0r
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12,180 Posts
If synthetic, and sealed I'd say no problem. Generally, there is nothing to break down since there is no ware and no organic components that will breakdown if synthetic. That's my opinion.. Sort of like adding an expiry date to bottled water... I don't buy that lol

However, if it was in the car and the car wasn't driven I would change it.
 
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