Oil in anifreeze of Toyota 22RE engine why?

Answer 1

Hopefull its because you blew a head gasket. That's the most common reason. Most of the 22re engines I have seen don't have a line from the oil pump feeding the radiator to assist with cooling. But also check the lines going into the radiator and ensure one isn't there. Could be, if you do , that this line broke in the radiator. Altho easier to fix than a head gasket its also more expensive if you are a do it yourselfer.

Do some pressure checks on the cylinders. Also a fair check is to remove the thermostat, fill radiator with fluid and keep the cap off the radiator. Try to start and see if you have a pressure blow the fluid out of the radiator. If so its definitely a head gasket.

Check to see if you have water in the oil too. Could be a crack in the engine block.

Good luck. Been there and done this.

If you need more help just edit the answer with a question and I will get it.

I too had this problem on a customers engine: Check carefully for damage done to the timing chain cover by a worn chain: Two shiny grooves are a dead giveaway! This can cause leakage from the water pump chamber, leading to water in the oil-sump.

My customers engine had had this problem in the past: the resulting aluminum welding was thin in places, pin holes, under a magnifying glass, were quite evident.