My grandson brought my daughters 1999 4 runner car over yesterday and said it needed some oil. I asked if he brought any and you know the answer to that. Found an old quart of conventional and looked at the dip stick- bone dry. Put the quart in and still bone dry. Found a 5 gallon jug of leftover good oil from my last Bimmer change that still had a quart and a half. Poured half that the jug in and still bone dry and the dip stick. Poured the other half in and still nothing on the dip stick. At this point I made sure I was pouring the oil into the engine and holding the correct dip stick. Made a call to my granddaughter who had changed the oil on this car while I was on vacation in Sept. on how much oil she put back into the car. She replied - a quart and a half! I went out and bought some more oil and put over another quart and a half in to get it to the full line. I asked my grandson if it was running okay and he said the only thing he noticed was it started up a little slower than normal. I have to say it must be a testament to the Toyota engineers that that car can run on 1.5 quarts of oil where it needs 5.5 quarts. I'm still a little flabbergasted. BTW, had my granddaughter point to the point in the car manual where it says how much to put back in. She found the correct chart, but said she got confused somehow.