Quote:
Originally Posted by Steiglitz
Grumpy, running 0W-20 in the Yaris will not cause engine death. Why do you write such lies? There are millions of cars that have used 0W-20 for trillions of miles with no issues, none. In fact, Toyota back-spec'd the 2007 Yaris to use 0W-20 oil, and I have never read of an engine failure from this. Ever. And why would Toyota do this for millions of in-warranty cars? If using 0W-20 caused engine death, then Toyota stands to lose millions of dollars on in-warranty repairs.
Also, using 0W-20 will not cause more engine noise over using a heavier grade of oil. Thinner oil means it flows faster, cooler and gets to all the parts faster upon first start up of the day.
Spend some time at www.BobIsTheOilGuy.com and educate yourself ;-) |
I am a degreed retired, Bell Laboratories Mechanical Designer/ engineer,experienced race engine builder and high-end automotive electronics package designer with a blooming interest in tribology. In my experience You CANNOT design an engine to specify 5W-20 and 5W-30 given the LARGE difference in operating viscosity at 100C. I Do NOT have issue with engines designed exclusively for 20 weight and agree to the successful application. But Toyota continues to specify a broad spectrum of oil weights and this is a recipe for disaster. You have no data as neither do I have (at hand) statistically relevant data on engine failure frequency; so you have not countered my arguement in any meaningful fashion. I
have had three engine failures, running cross specified 5W20 oil, in various engines - so I surely do have a very PERSONAL though anecdotal sample. I DO hear the engine noise and engine noise means boundary lubrication and boundary lubrication means engine wear over useful life - especially given current poor API standards for EP add packs. I stick to my guns and you have presented me with no data. Quote US (with footnote) some meaningful data.