Quote:
Originally Posted by ForteSX2.4
Kia recommends 5w-20 and that's good enough for me 'cause they warrant the engine for 10 years 100,000 miles if I use the oil they recommend.
It helps too if you know that several other car manufacturers have been recommending 5w-20 since 2001 -- like Honda and Chrysler.
You can find a lot of negative discussions about 5w-20 on oil company sites...and, of course, they have a better oil you should use...imagine that...LoL!
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Well, the negatives of using a 5w-20 on oil sites aren't merely superficial. Engineers know that heavier oils lubricate better, especially at high temp/heavy load, and protect against volatility or breakdown much better.
I actually read somewhere that Hyundai engineers were NOT in agreement with the company recommending 5w-20, as their engine research and testing indicated more wear with the 5w-20. I'm sure the EPA and CAFE were a major force behind Hyundai/Kia recommending 5w-20...and Honda and Ford also.
This is what worries me. Is 5w-20 just as good for the engine, or is it entirely fuel economy motivated, and marginally adequate for proper engine lubrication?
We're talking about longevity of an engine, not that the warranty covers something...in theory.
