it is bad for the catalytic converter and O2 sensor. It is also bad for the environment. Your engine also has less power due to the worn rings and loss of compression.
No, but burning oil will give you bad spark plugs.
Black and blue smoke means your engine is burning oil. That is bad. You may have a blown head gasket. That is very bad. You may have worn piston rings. That is also bad. I have no idea why your engine is burning oil but the reason is bad.
Burning oil? Bad rings or valves Overheating? Bad head gasket?
engine burning oil
If the engine is diesel, no that is normal. If the engine is gasoline, yes it is probably burning oil.
You either have an oil leak or the engine is burning oil cause by worn piston rings. If you see blue smoke it is burning oil.
your car has oil burning in the combustion chamber of your engine , need to rectify the engine block and replace piston rings
It is likely that the piston rings are bad, and the oil is getting into the combustion chamber. that is if it is burning oil.
Oil leak or the engine is burning oil.
Your 2002 Highlander might be burning too much oil because of an oil leak or because of bad rings or valve guides. The most obvious starting point would be searching for oil on the engine coming from a leak.
You can tell this before an oil change. If you see blue smoke coming out the exhaust your engine is burning oil. If you're oil level is low and you have no oil leak your burning oil.
The engine is burning oil