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SteveM C/IL 
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Joined: 12 Sep 2009
Location: Shelbyville IL
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 Topic: 30wt VS 15W40 oil pressure
Posted: 05 Nov 2016 at 11:01pm |
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Is it likely that you have higher hot oil pressure with 15W40 over straight 30wt? 15W40 is supposed to act like 40wt hot so that would make sense.Just wondered. I put 15W40 in my 220 last winter and used it for all fall work this year.It runs just under 60psi WOT and I could swear it use to only make 50 with the 30wt but,it's been about 6 years since it really got worked and I got CRS.
The 8070 is out of commission for the time being,ergo using the 220.
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CrestonM
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Joined: 08 Sep 2014
Location: Oklahoma
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Posted: 05 Nov 2016 at 11:11pm |
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Uh oh...another oil pressure thread! Batten down the hatches!!
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DrAllis
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Posted: 06 Nov 2016 at 12:07am |
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Not been my experience. 30 wt will carry a couple more pounds of hot oil pressure than 15W-40 does.
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Lars(wi)
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Posted: 06 Nov 2016 at 6:28am |
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Years ago, I owned a delivery truck (IH 2155 w/ dt466) that did alot of slow idle with a pto, in the summer I ran 30w, in winter 15-40, it alway's showed higher pressure even in the hottest day's with the 30w that it did in the winter with 15-40.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Gary Burnett
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Posted: 06 Nov 2016 at 7:13am |
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I run 15W-40 diesel grade oil in every engine I own and when I change oil the first time in a tractor I buy the oil pressure almost always increases,of course i don't have any way to know what was running it when I bought the tractor.
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ac45dave
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Posted: 06 Nov 2016 at 7:20am |
 CrestonM wrote:
Uh oh...another oil pressure thread! Batten down the hatches!! |
I think we're all pretty safe now.the arrogant know it all, that caused all the havoc lately and took threads off topic and turned them into his own personal pi$$ing match was suspended and shut down last week.  thanks moderators.
Edited by ac45dave - 06 Nov 2016 at 7:27am
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54 wd-45gas ; 56 wd-45d N/F w/fact p/s ; 63 d-17 sIII N/F gas ; 60 D14 N/F ; 67 d-17 sIV N/F gas ; 63D15 sII W/F; 39rc#667 ; 2021 massey 4710 fwa ; gravely 2 wheel tractors
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Dan73
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Posted: 06 Nov 2016 at 7:21am |
CrestonM wrote:
Uh oh...another oil pressure thread! Batten down the hatches!! |
2x LMAO
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ac45dave
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Posted: 06 Nov 2016 at 7:25am |
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i always found in my own experiences, straight weight oil to carry a little higher pressure than multi weight oils.
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54 wd-45gas ; 56 wd-45d N/F w/fact p/s ; 63 d-17 sIII N/F gas ; 60 D14 N/F ; 67 d-17 sIV N/F gas ; 63D15 sII W/F; 39rc#667 ; 2021 massey 4710 fwa ; gravely 2 wheel tractors
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steve(ill)
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Posted: 06 Nov 2016 at 7:51am |
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the straight weight might have a slightly higher pressure than the 15w40. "Theoretically" they should be similar , but remember, the multiweight is a combination trying to solve multiple problems. The main advantage of a 10w30 or 15w40 is not the pressure when HOT, it is the advantage of thin oil when COLD to get the oil flowing quicker.
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Like them all, but love the "B"s.
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SteveM C/IL
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Location: Shelbyville IL
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Posted: 06 Nov 2016 at 8:51am |
DrAllis wrote:
Not been my experience. 30 wt will carry a couple more pounds of hot oil pressure than 15W-40 does. |
That would have been my guess too.Kinda why I ask.I guess I'm okay with what it is but am a little puzzeled.
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