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I have never seen true evidence of antifreeze in the oil, but it looks blameworthy.
A bit of history
Last year I put a new water pump on when it started leaking around the bearing. I was loosing a lot of fluid. But even after I changed I thought it was strange that I could still smell antifreeze and was loosing fluid, but none was ever found on the ground or leaking that I could see, I even shampooed the engine. I did notice that in the extreme hot weather last year that I had to keep topping up the fluid every couple of weeks. Now this year has been pretty cool summer and I have not topped the fluid up once, however there is now a black oily ring inside the overflow bottle. The inside of the radiator cap also oil on it and there is a rind around the neck of the filler.
I have been changing the oil every 4 weeks now weather it needs it or not to help slow down any damage that might be getting done to the internals. The oil is usually black or brownie colour and it is on the watery side, no foam is evident in the oil at all. When I take a left corner a bit quick I can now hear a rumbling noise coming from the motor as if it were on the low side. I have always kept the oil at the proper levels. Right after an oil change the van gets more peppier and responds when it should but other times just before its time to change my monthly oil it gets sluggish and I end up getting heavier on the gas. Funny thing now I remember just before I stared changing my oil every month that my gas usage went from approx. $60 a week to $
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