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Oil seems to disappear .no drips,or obvious leaks to be seen.oil light flashes on momentarily.dip stick shows no oil. Googled problem.seems to be many many similar questions,no obvious answers. Is there a computer type check that can be run, what is best oil,and how much to put in when empty.have you heard of this problem. I have had Toyota cars for 30 years and never come across anything like this.please help.