Check oil level-if creamy, whitish brown, coolant is leaking into oil- could be head gasket, possible crack somewhere-have it pressure tested for leaks
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SkyActiv engines, regardless of displacement, never fill completely (according to the dipstick) using the recommended fill volume. Your experience using 5 full quarts in a 2.5 liter is exactly what others have experienced.
Don't know the exact amount but around 2-2 and a half gallon. Do this use one gallon straight antifreeze and one gallon water run engine for a few minutes then turn off. Check level and top off radiator. Add appropriate level to side tank
Park the car uphill, take cap off radiator, start car, fill radiator, let it warm up until thermostat opens, bleed air out, fill to the neck of the radiator and watch for bubbles coming up. Once you have bled the air, if gas continues to come out, you have a blown head gasket. Also check the exhaust for excess moisture and the smell of coolant. You may be able to determine which gasket is bad by looking at the plugs and/or running a compression test. Let me know if you have more questions.
The check engine light doesn't monitor those things, it's an emissions warning. monitors a host of things that are emissions related. You need to have it checked by a technician. The most common cause is a loose (or defective) gas cap. Make sure it clicks when you fill up. As for being 1/4 qt low on oil, don't add that small of an amount. Only add if it's a full quart low. If you check it soon after the engine has been running it'll show low because there's still a lot of oil upstairs in the engine. The dipstick measures what's down low in the oil pan. Also don't add anything to the radiator; only add to the overflow jar. It's marked high and low; those are actually temperature dependent marks, it should be at the high mark when the engine is warm and low when the engine is cold. Coolant expands and contracts with temperature. Don't add straight H2O either; that should be 50-50 coolant/water. They'll do that when you get the oil changed.
Over filling the Coolant will not hurt anything. Is it getting hot at all?????? If So, You may have a Bad Thermostat. or even Waterpump. Let me know! Please Rate My Response! Thanks!
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