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Gas or oil leak? Gas leak can turn the light on. Oil doesn't. Try to notice where the leak is under the car on the ground. Look under the car and see where the leak is on the frame. All this helps. Have the codes read.
Suggests sign of internal leak. Check dipstick for engine oil to see if there is a sign of coolant mixed with engine oil. (Generally foaming of oil instead of amber or dark solid color) (Could even show level is high due to coolant adding to oil and raising level.)
If there is, it's a very serious problem.
One quick way to try a very inexpensive fix that's worked for me is a product called Barr's Leak. (It's worked twice for me on two cars.) Get the expensive "copper" version (looks like liquid copper) and add to your coolant system following manufacturer's instructions. Top off coolant and then drive car for a couple of full engine temperature sessions.
If coolant then no longer goes down, change engine oil draining out old coolant that may have contaminated it and refill with new filter.
Keep an eye on level after that to see if coolant level remains stable.
If coolant still goes down, a engine over haul or new engine may be needed.
The ticking noise is can be a sign of low oil pressure or worn out oil/wrong oil grade. Since you just changed your oil I would say that it is not the oil. The decrease in ticking comes from the new thicker oil. If you have an oil pressure gage, locate the oil pressure switch or any other oil passage to the engine and connect the gage to the passage and check the oil pressure and compare that to the mfg specs.. The oil pressure will most likely be something between 30-60 when the engine revs up a little but do check the mfg specs from a manual or call the dealer for the info.. If it has very little or no oil pressure it could cause extensive engine damage or complete engine failure. It is best to check the pressure or have it checked before you continue to drive the vehicle.
Hi, A car leaking oil will never result in the engine not starting, unless the engine has already seized. Before any corrective action can be taken, you need to determine where the oil leak is originating from. Depending upon several factors, this could be easy or it could be hard. One suggestion, do not use any of those quick fix oil additives to "fix your leak." The projected cost to fix your leak, will depend upon where your leak is. Good Luck!
Coolant either leaks out, evaporates, or is exhausted through the engine. Check your oil & see if you notice any coolant mixed in, indicating internal seal issues. Also, you can have a small amount of coolant drawn into the engine cylinder & exhausted as steam or vapor and never notice. If only a small amount and no noticeable engine problems, evaporation. Engine miss sometimes & refilling anti-freeze often is an internal leak, generally the Head Gasket. Very rarely, a transmission (automatic only) has been found with antifreeze in it due to a leak in the radiator/transmission cooling system. Good Luck.
Assuming you meant "RPMs Increased as speed decreased." This is usually referred to as a "slipping" condition in an automatic transmission. It's much like when your clutch wears out and it starts to slip. THe engine revs up and you go slower! Especially driving up hills since the load is greater on the powerplant. You should be darn sure you are full of Trans. fluid. Check it properly like your manual describes. If you are in the operating range of fliud level, your transmission is likely going out. If this sounds like your problem, take the car to a qualified service center, not the local quickie oil-change outfit, for an expert opinion.