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Q: Can oil leak into cylinders thru intake manifold? misses on start then smooths on 1994 Toyota Previa

out oil level in reservoir dropping. also appeared to be coolant coming out of exhaust(white smoke)replaced water pump now no loss of coolant but oil level still dropping.
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Sure sounds like coolant instead of oil. A combustion leak test will tell. If it were oil it should smoke all the time it is running. Coolant seeping into cyl. while parked, then clear up after burning out of cyl. more likely. Oil leaking out of engine maybe? How much oil in how many miles?
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