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Unread 08-14-2009, 09:18 PM   #1
austtill
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which is thicker 15w 40 or 20w50

ok guys i know this is a stupid question which is thicker 15w 40 or 20w 50.i want to put a thicker oil in my jeep but i dont which is thicker or maybe u guys could suggest a weight of oil to use.thanks.

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Unread 08-14-2009, 09:31 PM   #2
Kruzin
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The higher the number, the higher the viscosity.
In XX-W-XX multi-weight oils, the low # reflects the cold viscosity, the high # reflects the hot viscosity.
20w50 is thicker at both low and high temps than 15w40.
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Last edited by Kruzin; 08-14-2009 at 09:41 PM..
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Unread 08-14-2009, 09:34 PM   #3
comptiger5000
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Kruzin - Other way around on the hot vs cold. A 15W-40 is designed to measure the same as a hot 40 weight when hot, and the same as a cold 15 weight when cold. Still thicker when cold, however.
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Unread 08-14-2009, 09:37 PM   #4
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Thats how I always knew it ^
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Unread 08-14-2009, 09:43 PM   #5
Kruzin
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Originally Posted by comptiger5000 View Post
Kruzin - Other way around on the hot vs cold. A 15W-40 is designed to measure the same as a hot 40 weight when hot, and the same as a cold 15 weight when cold. Still thicker when cold, however.
You are correct...Typing faster than thinking...and I corrected my post.
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Unread 08-14-2009, 09:43 PM   #6
austtill
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what i want is a weight to hold better oil pressuse at both ends something that wont drop off when hot.but still have high when cold dont know if i can find that or not.
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Unread 08-14-2009, 09:49 PM   #7
Kruzin
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10w30 or 10w40 will do just fine. Even 5w30.

It's just oil. As long as you keep it clean, change it at regular intervals (3-5k), you're gonna be fine.
Oil pressure means jack. As long as oil is flowing, it's all good.
If you put a high velocity oil pump in, you'd get higher pressure all the time...but it aint gonna help anything.
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Unread 08-14-2009, 10:02 PM   #8
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Originally Posted by Kruzin View Post
10w30 or 10w40 will do just fine. Even 5w30.

It's just oil. As long as you keep it clean, change it at regular intervals (3-5k), you're gonna be fine.
Oil pressure means jack. As long as oil is flowing, it's all good.
If you put a high velocity oil pump in, you'd get higher pressure all the time...but it aint gonna help anything.
Oil pressure is not important? Ok thats a new one. I guess ill be fine going down the highway towing a trailer in 100F heat with 5 lbs of oil pressure and be ok? Dont think so.
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Unread 08-14-2009, 10:06 PM   #9
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Oil pressure is not important? Ok thats a new one. I guess ill be fine going down the highway towing a trailer in 100F heat with 5 lbs of oil pressure and be ok? Dont think so.
If you have this scenario, you probably have a bad oil pressure sender, causing a false reading on your guage.
Factory guages are notoriously inaccurate.
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Unread 08-14-2009, 10:10 PM   #10
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Originally Posted by WiCkeDuDe View Post
Oil pressure is not important? Ok thats a new one. I guess ill be fine going down the highway towing a trailer in 100F heat with 5 lbs of oil pressure and be ok? Dont think so.
no, but you should be fine with anything above 30
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Unread 08-14-2009, 10:25 PM   #11
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yeah on the off chance that the gauge might actually read right for once, even if you have 40 psi, you could have a hhuge blockage still that keep the pressure up but your not actually flowing to the important stuff
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Unread 08-15-2009, 09:42 AM   #12
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Quote:
Originally Posted by Kruzin View Post
If you have this scenario, you probably have a bad oil pressure sender, causing a false reading on your guage.
Factory guages are notoriously inaccurate.
Um yeah. Heard of being sarcastic anyone? Oil pressure is a important factor as well.
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Unread 08-15-2009, 10:06 AM   #13
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Originally Posted by comptiger5000 View Post
Kruzin - Other way around on the hot vs cold. A 15W-40 is designed to measure the same as a hot 40 weight when hot, and the same as a cold 15 weight when cold. Still thicker when cold, however.
I second that motion!
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Unread 08-15-2009, 01:06 PM   #14
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Oil pressure means jack.
huh? what? confused...
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Unread 08-15-2009, 04:06 PM   #15
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wow this post went south quick just like oil pressure ha ha
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