Magnatec is a good oil, but is only a hydrocracked dino oil, but the law states it can be called a semi synthetic...
It also has a very high ash content which can block oilways if left in too long..
Some of the best oils are Mobil 1, fuchs, silkolene, motul etc of the fully synthetic type..
The recommended oil is Toyota longlife, which is fully synthetic, hence the long time between changes.. semi synth should be changed earlier..
There was a special offer at my local toyota dealer, who had the longlife oil for £12 (half price) so I bought a couple..
John