Toyota specifies 0-20# motor oil but the only oil I see of that weight is synthetic.?

Anyone know if there is any NON-synthetic oil that is 0-20 weight? I can't find any if there is, but it should be cheaper than the synthetic stuff. And I have to change it every 5k miles so I'd like to use dino oil if at all possible.
I believe everything you guys are saying but Toyota specifically says I must use 0-20 and I must change at 5000 miles. I would go longer if it wouldn't void the warranty. It says I can use 5-20 if 0/20 is not available but then must use 1-20 on the next change.
 
Toyota wants you to use synthetic oil for MANY reasons. It will NOT make sludge, the enemy of ALL engines. It increases fuel mileage and power and protects expensive engine parts best. ALL regular oils will eventually sludge things up inside. If you don't like the price for 0W-20, shop around. Mobil One oil 0W-20 and ELF oil made for Toyota should last for one year or 15,000 miles. In my neighborhood, O'Reilly's usually has good prices. Use ONLY a genuine Toyota oil filter. Stay away from Valvoline, it is made the cheapest way, the wax reduction method. It always creates brown waxy deposits. YUCK!! Don't skimp on this car! IT is worth the price it costs to keep it running best and longest. Believe me!!! THe only oils to use will state on the label, "designed to meet or exceed Toyota specifications." Get it??? Got it??? Good!!!
 
0W-20 is only full syntetic. You can use 5W-20 which you can get as a synthetic blend. It wouldn't hurt it if you use 5W-20. They only advantage of 0W-20 is if you start your car in -40 degree weather. If you were to bring your car to any oil change place or the dealer they would just use 5W-20 if you were to get a normal oil change.
 
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