Coolant and engine oil. EG vs PG, is one less damaging?

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Found an old 2001 post suggesting EG coolant damages bearings at 0.5% by volume, whereas PG didn't cuase damage up to 8.0%
I haven't been able to confirm that, but would like to know.

Recent oil analysis (22ppm potassium at 46k on oil) indicates a possible small intrusion of coolant into my engine oil. From a few posts here and elsewhere, it was suggested that EG damaged bearings at less than .4% by volume, but PG did not at up to 8%. I can find no substantiated proof of this. Besides searching, I have talked with Blackstone, Fleetguard, and Fleetguards oil analysis tech. None of them had any info that one was less damaging than the other.

If I were sure, then I would switch to PG as a precaution, but hate to waste good coolant if no advantage. Anyone have any input on this? Preferably with some studies or sources I could refer to.

Thanks
Don

3/22/055:11 PM

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Original Post

callisaMember

Wear is somehow a miracle. It does not appear always to 100% just because one parameter is NOK. Sometimes this happens just at 2-5% of all cases. So, how do you know whith one single case if there is a general problem or not?

I am rather sure that you will not find a study proving this theory.

What I can tell you is that you may get corrosion in your cooler by using the wrong coolant.

A Potassium level in such a low range is in general no problem, but it might be a good idea to check your engine for leaks.

3/23/059:59 AM

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