I own a 2006 model vitz (1KR-FE Odometer: 120000 KM). Since from day 1 I have been using 10W-40 Grade oil for my car without any issues; however, from past 2 months i have observed that AFTER (NOT BEFORE) 3000KM the oil level decreases a bit (about 3 4mm). If fill up again it decrease again after 1500 KM to the same level. I first concluded that the rings are worn out but there is no blue smoke from the exhaust (even i rev up the engine) and there are no visible leaks.
Any guesses about the problem? what about valve seals? i have heard that sign of poor valve seals is blue smoke while cranking or reving up the engine.
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