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Although the basis here is Blending Synthetic and Mineral oils, further down applies to all oils.

The effect depends on the types of synthetic bases that were mixed with mineral bases. Polyalphaolefin and diester synthetic bases can be mixed with mineral oil bases, which is done regularly to create “blend” products.

Polyalkylene glycol (PAG) bases should not be mixed with any of the others unless specialized barrier fluids are used to minimize the incompatibility. When PAGs are mixed into other lubricants, you typically will get strong negative reactions (producing sludge and tacky residue) that require extra effort to flush, clean and correct.

Even if the base oils are compatible, there is the prospect that the additives used to create necessary performance properties could conflict, producing lost lubricant effectiveness.

It is advisable to perform filterability, oxidation stability, air release and demulsibility testing prior to mixing lubricant intentionally.

Remember, modern lubricants are sophisticated products, formulated to meet the demanding lubrication requirements of modern equipment. The old saying, “oil is oil” no longer applies. Mixing lubricants is fraught with danger — to your equipment, to your business and to your wallet. When in doubt, don’t mix different lubricants. If it occurs accidentally, address the problem immediately.

In its mildest form, mixing different lubricants may lead to a degradation of lubricant performance. Mixing the same API grades of synthetic passenger car motor oil and mineral oil-based engine oil won’t damage the engine, but you will lose the performance features you expect from the synthetic. At the other end of the spectrum, Deposits may form that could increase wear and plug filters.

Bob
 

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Spot on and good advice as usual Bob. Thanks for that.
 

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Hello...just a fast post that I am Amsoil dealer out in the Chilliwack, Harrison Hot Springs, and Hope area....for any of you that might be near by.
 
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