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I would say that refreshed the oil :-) and I need to changed not after 3000 miles but after 1500 miles.
So, if it is just simle mixing solutions and they do not have an effect on each other, I would say I will change a coolant not in 3 years but in 1.5 year?
If it is no contamination of any sort, or catalic reaction inhibition.
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1987 MB260E 187K
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