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jarre,
The idea works well enough to separate the physical impurities but the chemical degradation to the oil remains.
When I was working for a mining company we had a fleet of Caterpillar diesel trucks and stationary generators. It was remote location and it snowed in the Winter.
We used the oil from the trucks in the heaters after centrifugal filtering.
It works but there is a lot of energy required to filter the oil (we used a four stage filter process) and the product is nowhere near the quality of new oil.
We had Mobil test it for us and they said it is OK for a boiler or space heater (ours were Lamborghini) but that was about all.
Pete.
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