Quote:
Originally Posted by MikesZ06
Here's what Blackstone Laboratories has to say concerning oil viscosity...
"For the sake of efficiency you want to run the lightest grade oil in your engine possible, within limits. We are seeing that trend for newer engines, for which the recommended grade is getting progressively lighter. The common 10W/30 has become a 5W/30, and some manufacturers even recommend 5W/20 oil. On the other hand, we can't see (in oil analysis) where it hurts anything to run heavier 10W/30s or even 10W/40s in modern automotive engines. The heavier oils provide more bearing film, and that's important at the lower end. If your oil is too light, the bearing metals can increase. If the oil is too heavy, the upper end metals can increase. The trick is to find the right viscosity for your particular engine, which is why we suggest following the manufacturer's recommendation."
Mike
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I made a post about this on b15sentra.. as far as efficiency is concerned friction makes up LESS THAN 10% of your engines losses. so for those of you who are wondering, No, using 0W-30 won't save you any money - yes it will screw up your engine. 0W-30 should onlybe used where it's very cold.. like Alaska
