Posted by dhermesc on May 16, 2011 at 06:17:53 from (24.248.193.103):
In Reply to: Motor Oil posted by 37chief on May 14, 2011 at 23:00:26:
30W will actually be thinner (have less viscosity) at operating temp then 15W40. But monograde motor oil is actually more stable and less prone to break down at high temperature and during prolonged use when running an engine hard for 8-20 hours at a time.
Thicker (higher viscosity) is not always better. On a fairly worn engine where its beyond factory tolerances using 40 weight instead of factory recommended 30 weight won't be an issue at all and probably even be better. However if the engine is still "tight" and within factory specs I would use the thinnest oil the factory recomends to ensure everything gets lubed.
Oil coats the internal moving parts and prevents metal on metal contact. The manufacturer recommends an oil that is thin enough to coat the metal and prevent metal on metal contract but thick enough to not break down under heat. With oil too thick (high of viscosity) and it literally can't coat the moving the parts until enough wear (excessive tolerance) has occured to give the oil enough room to coat the parts.
If you engine is good and tight I'd use straight 30 weight in the summer and 10W30 in the winter. If its "loose" burning a bit oil I'd use 15W40 year round.
If you have a brand new car engine that recommends 5W20 but put 15W40 in it because that's what all your other engines use you'll cause as much wear in one oil change as 100K of driving. If you go back to 5W20 on the next oil change it wouldn't surprise me it it started buring oil.
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