good compression, car is consuming oil.?
Tires plus told me that my car needed a new engine due to worn piston rings. Neither my grandfather and I believed this because the car is quite as a mouse and runs great (off highway). On highway at high speeds the car pings. It consumed 2 quarts of oil in a 500 mile trip. No smoke that I can see. Took it in today said the compression is good and no leaks. WHERE is my oil going? I'm sure the consumption is what causes the high acceleration ping, but my car passed compression on all 4 cylinders. Possible to have worn rings with good compression?
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If there are no leaks anywhere in the engine the possible issue could be that your valve seals are bad. Oil goes over your valves to keep them lubricated and if the seals are bad it will seep into the cylinder. The reason you don't see any smoke is because not such a large amount of oil seeps in at one time but in the long run it will wear it out. Now there is a possibility that it is also causing the ping but it can also be caused by a bad fuel to air mixture or bad timing. Get those valve seals fixed and if the ping persists then you might want to check those 2 things. Good luck, hope this helps.
Wish you had listed the year, make and model of your car and the number of miles on the odometer. The first thing to do is shine a flash-light down through the area where you add engine oil to. If it looks dark brown or black, it's time to switch motor oil brands to Mobil1 which has strong detergents to clean the piston ring lands, oil rings and oil ring return holes in the pistons. If the piston rings are not free and clean they can not control the normal oil splash on the cylinder walls from between the connecting rod journals.
Wish you had jotted down the compression numbers. Good compression, 135 psi. or higher should mean the rings and cylinder bores are STILL IN GOOD SHAPE.
You can have bad oil control rings causing oil consumption but great rings above that which can give you good compression. You can also have bad valve seals and worn valve guides allowing a lot of oil to drain into the cylinders and burn off, and may not even smoke when it's doing that, so you have two methods for losing oil.
oil will get past the rings in a good engine still. it is a fact of life. valve stem seals and guides are another path. the pcv valve is yet another. you may have a small leak or be using an oil that is just too thin for the mileage. the ping is not from the oil. timing needs to be checked and adjusted. a lean mixture will trigger a knock or ping also in relation to the high heat generated.
There is also the possibility of the rear main seal leaking and it not being noticaable because it only leaks when you're driving. That's the cause of the oil line you see down the middle of every traffic lane.
it somewhat is the two burning it, oil entering into the combustion chamber, difficulty with rings, or valve seals, or something else in the combustion chamber. Or it somewhat is leaking, consistent with risk in basic terms while the motor vehicle is shifting. you ought to discover it, we gained't see it. sparkling the undercarriage of the engine and vehicle and visual show unit the place the oil comes from. that's the terrific i can do.