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Most Toyota shop manuals specify an oil consumption rate of up to 1.05-quarts (1.0 L) every 932-miles (1500 km) as within factory tolerances. Accordingly your engine is nearly 200% above this acceptable burn rate. That being said late 1990s Toyota engines have well known issues with sludge buildups that may be rectified through engine flushes, ring-pack clean-ups, and the use of Group IV synthetic motor oils. Such ring pack build-ups can easily increase consumption on an otherwise reliable Toyota powertrain.

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9y ago
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Q: Is it OK for a Toyota Corola 99 100k to need every week to add 1 Qt oil after 500 miles of driving?
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