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what is the difference in SAE30 and 10w30?
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Originally posted by DOHCTR -
SAE30 is straight 30-weight motor oil and 10w30 is a blend of 10-weight and 30-weight. -
so which is better for a new engine?
Originally posted by DOHCTRComment
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10w-30 (5w-20 for some engines)
I only ever used straight 30-weight in older 60's - 70's model push rod engines.Comment
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somewhat false.Originally posted by The King View Post
10w 30 means its 10 weight when its cold and 30 weight when the engine is at normal operating temperatures.
the W stands for winter.
For new engines, im not for sure which is best, but i wouldn't go with a straight 30 weight, i broke my honda engine in using 5w30 Valvoline, changed 500 miles, and then 1500 miles and 3000 miles to be sure i had fresh oil during the break in period.
If youre making a lot of power, a thicker oil would be better, and i base this off of a Ford GT with 1500hp used 5w50. More cushion for that piston Pushin..
320rwhp. 7.67 @ 90mph 1.7 60'
DD: 2004 GMC Sierra VHO 6.0 LQ9 324whp 350wtrqComment
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Check the data sheets here: http://www.bobistheoilguy.com/aehaas/oildatasheets.html
The difference is just in how the oil viscosity is rated... the operating ranges are different. If you had an engine built, your builder should recommend the correct oil. If it is a new car then you should go by whatever the owner's manual says. This is not the area where you want to experiment.Comment
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Actually some of it is. The w does stand for winter not weight like some think. 10winter30 means its a lighter viscosity oil in certain temperatures to make it easier for the motor to pick up the oil when its cold, as the engine temp rises and tolernces change the viscosity gets heavier or thicker to act as a cushion , cleaner, and a lubricant etc. 30 weight oil sticks to things bettter than and a lighter thinner 5 or 10 weight oil. I'm sure there is much more to it but this is about it in simple terms.
I break older engines in with RotellaT 15-40 but for new cars just go with manufacturer recomended oil.89 dove grey lx, turbo blowthroughComment
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10w30 poors like a 10 weight at 77 degrees, protects like a 30 weight at 187 degrees...........pinto gt with wood trimComment
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I'm amazed at how misunderstood oil viscosity is. Engine oil is "thicker", ie higher viscosity, at lower temperatures and "thinner" at higher temps. Almost every fluid in this world acts the same way.
Good God, Ubil (aka 360 Notch) is probably rolling in his grave right now.Last edited by TENGRAM; 05-13-2011, 01:44 AM.Comment
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No, that's not how that works. Oil is different.Originally posted by TENGRAM View Post
320rwhp. 7.67 @ 90mph 1.7 60'
DD: 2004 GMC Sierra VHO 6.0 LQ9 324whp 350wtrqComment
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Tengram is right on all accounts and I would trust his knowledge and Grapes before I would the newbs...Originally posted by SilverbackComment
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320rwhp. 7.67 @ 90mph 1.7 60'
DD: 2004 GMC Sierra VHO 6.0 LQ9 324whp 350wtrqComment
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10W-30 means it is a 10 weight motor oil PERIOD! W is the winter or cold pourability.
the end number 30 means the oil will thin down an equal to what a 30 weight would thin down at operating temps.
If a straight 30 weight oil thins down say 4 viscosity points then your 10 weight is now 6.
Oil doesn't thicken up when hot!Comment
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No, he is right. Have you ever changed the oil on a hot engine? It runs out VERY quickly. It is thinner at higher temps and thicker at lower temps.Originally posted by 91CoupeMike View PostComment
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