Could a bad water pump leak coolant into the engine and into the oil so it would show up on the dip stick. I had a coolant leak but had the water pump changed and the system pressure tested and it holds pressure but before the water pump was replaced I had a major coolant leak into the oil. I didn't think a pump would leak into the oil.

Thanks

Sometimes if the waterpump is mounted into the front cover portion the bolts that mount it can rot away and coolant can bypass at that point. If you get that happening on a front cover then it will go into the engine oil pan and mix with your oil.

Just depends on what type motor you have.