because your radiator water is leaking into your oil somewhere, could be a head gasket or a crack in the cylinder block between the water jackets & oil jackets, check out your radiator water condition chances are you will also have "foaming" there as well, the "foaming occures because oil & water doesnt mix & when you heat up the two liquids togather you will get a foam reaction as the water absorbs more heat than the oil therefor there is a difference in the tempretures between the two liquids in the same container. Get your car looked at by a mechanic.
If it is high enough to be splashed by the crankshaft it would foam up. That would cause a lack of oil pressure and engine damage.
Water is getting into the engine. Change the head gasket before it blows.
You probably have a cracked engine block and engine coolant is mixing with engine oil.
You need to change the oil before driving the car. The Wiper fluid will dilute the oil causing it to foam up and not lubricate the engine.
If you have too much oil in your pan there is a possibility that the crank will whip it up into a foam. Your oil pump will no pump the foam so your engine will not get the lubrication it needs. No lubrication = seized engine.
Viscosity breakdown
As long as there is oil in the engine it can run. If it has not had an oil change for a year even if it was stored I would change the oil/filter before driving this car.
if the oil body is different the sound will change...did you use oil of the same viscosity?
No, that's caused by oil problems (sludge, foam, improper oil change schedule) or sometimes just plain engine age.
Anyone wishing to protect their engine.
Most likely a blown head gasket. Foam or froth is caused when antifreeze mixes with oil in the crank case. Could also be a leaking radiator if it is a dual engine/transmission coolant system. Can also be you overfilled it and the crankshaft is making contact with the oil creating a froth of air mixed with oil. Drain the excess out if it is overfull, as this will destroy the engine.
probably moisture, not good Oil level over full