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there would be no damage to the engine as there is a bypass in the filter that still allows oil to the bearings when the filter is blocked
check for problem cam follower that may be damaged from unfiltered oil
If you need to ask this question you should consult the service department at a toyota dealership..... but i will save you the time and them the agony.... maximum i would change any oil in any vehicle is 5000 miles (8000kilometers) but as i say it never hurts to do it early. oil cahnges are cheap in comparision to replacement engines. break-in period of a toyota engine is closer to 20,000miles (32,00kilometers) in that time i would recommend replacing the oil at 100miles, 500miles, 1000miles, 2500miles and 5000miles on the odometer (not between changes).. break-in period is the most critical in an engines life. after that, regular oil changes make the difference between 150,000miles and 500,000 miles. I got a '97 rav with 282,000miles and it still runs llike a champ. treat it good and it will run forever... FOREVER TOYOTA....
If it's not specified in the owner manual, and if it's not already been replaced, 90,000 miles (144,000km) is probably the longest you should wait before replacing it.
see if you have any oil level or pressure sensors. sometimes these can get gunked up. You may need a new oil pump. I suggest you start using a senthetic oil (valvoline,mobil 1 is reccomended) after u get the problem fixed.
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