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mike113 wrote:
> Hi, honda recommends to use 5w-20 oil but can i also use 5w-30 oil > instead. Cause they are easier to find in stores and are cheaper. Here's one thing to think of. Apparently most 5W-20 oil uses high levels of molybdenum antiwear compounds to reduce friction and to prevent metal to metal contact. There's a question as to how quickly the moly is depleted. <http://www.imakenews.com/lng/e_article000052004.cfm> Fuel economy demands, in particular, are expected finally to propel these oils more deeply into the marketplace. Ford Motor Co. research cited by Igarashi indicates that 0W-20 engine oil can increase fuel economy by up to 3 percent over 10W-30 (currently Japan's most popular engine oil grade). "However, in order to [make] 0W-20 engine oil, the base oil must be Group III, or Group IV (polyalphaolefin)." Another driver will be the use of organic molybdenum as a friction modifier. With molybdenum, "you can gain friction reductions of up to 10 percent at low engine speeds. However, a big drawback is the loss of effect over time; the friction reduction is lost quickly due to additive depletion. By using Group III or polyalphaolefin base oil, there is better retention of the friction reducing properties," due to the oils' better oxidative stability, Igarashi explained. |
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