5w20, My .02

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Originally Posted by dallas

Some dealerships will use 5w30 over 5w20 because generally its cheaper in bulk. I have lubricants training and used to sell lubricants (9 years worth) and now run a performance tuner shop inside a Toyota dealership. I personally run a light viscosity 5w30. .02 mpg is not worth less life out of an engine.

i'm a little confused. i always thought the weights WERE the viscosity numbers. isnt a "light" 30 weight oil, by definition, NOT a 30 weight oil?? kinda like a 150 lb guy saying, "im a light 150 lbs." uhhh, you're either 150 or you're not. i would like it if you could further elaborate on "light" 30 weight oils, however, since if i CAN use a 30 weight oil that gives the efficiency benefits of a 20 weight oil, i'm all for it. currently using amsoil 0w-30, and planning on switching to 0w-20 as soon as i run out... thanks.

--B