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At my first 7000 miles, i did not like the color of the engine oil, took a sample and send it to Case for analyzing,($18), came back ok... 211 ppm of silicon, should be around 20-30 ppm, did go to the dealer, and they were "kind" to do the oil+F, change at 7000 miles, it is two years...

engine is manufactured in: Toyota Motor Manufacture West Virginia, Inc (TMMWV)

Smart, thanks

Dear forum, Happly bought a brand new 2018 corolla L, After 7000 miles, no problem, i guss i got board, ( prevuse car Mercedes 300SDL 1987) I checked oil, it looked bit cluady , Took a sample, and send to SOS caterpiler, Answer was all ok , Silicon(dirt) is high,211 ppm,(normal 20-30ppm)...