08 Yaris Manual Sedan Running Poorly

[SLIFox]

Originally Posted by 2bz

Oil/coolant interaction. Did you have an overheating event? I'm going to go with number 1 below.

Blown head gasket
Defective or deteriorated seals
Improperly torqued head bolts
Thermally warped or cracked cylinder heads
Cracked block or cylinder head from frozen coolant
Improperly machined head and block surfaces
Corrosion damage of cylinder liners
Damage or corroded cooler cores
Water pump seal failure and weep-hole blockage

No never overheated in it's life, it was my first manual car and did have a rough start when I was learning.
I have only done 6000km since I got it with 227000km on the clock now.
Probably never had valve seals or anything checked.
What are the main things that can go first and foremost? Valves sealing be an issue?

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