My montero sport is burning oil what the cause.?
Could be worn piston rings letting oil into the top of cylinder from below, or worn valve stem seals or valve guides letting oil in from above.. A shop could do a compression test or a leak-down test and give you a good idea of the engine's health. Low compression on any of the cylinders means the rings or valves are not sealing well, and could let oil in to burn. Either of the tests could point to the problem, but a leak-down test is considered the more accurate test
How much is burning? If you are burning more than a quart every thousand miles, it is a problem that needs attention. Most car makers say a quart every 3 thousand miles is not a problem and may be considered normal, although owners may dispute that as they often do. Some engines just seem to lose no oil between oil changes, but most do use or lose a little oil between changes, it is normal. If your oil consumption is on the high end, have the test done. If your rings are good, a cylinder head job (for the valve work) is much less expensive than an engine rebuild.
on May 29, 2012