multi grade oil
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Joined: Jun 2003
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From: florida
Car: 1984 Pontiac Firebird
Engine: modded 5.0
Transmission: modded 700r4
multi grade oil
i've done a search but didn't find anything. Does anyone know at what temps a multi grade oil switches grades? In other words, when (at when temp) does a 10w30 oil act like a 10 weight and when does it act like a 30 weight? thanks!
Joined: Mar 2000
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It doesn't work quite that way. The oil is tested at low temp and assigned a "W" viscosity, and tested at high temp for the no-letter viscosity.
That's all there is to it.
Oh, the "W" stands for "winter", not "weight". A straight 30 weight is "SAE-30", not "30W". And, 20W-20 is actually a multi-viscosity oil.
That's all there is to it.
Oh, the "W" stands for "winter", not "weight". A straight 30 weight is "SAE-30", not "30W". And, 20W-20 is actually a multi-viscosity oil.
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