Driven GP-1 oil
#2734086
01/18/20 09:37 AM
01/18/20 09:37 AM
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Joined: Jan 2007
Posts: 8,067 Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,067
Mt Morris Michigan
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OMG, another oil thread, yep. I have been looking for a good oil to replace the 15/50 Amsoil I have been using because according to the oil grade/bearing clearance guide I should be using a 10/40 or 15/40 group oil. Amsoil does not offer this group in a racing/flat tappet oil. They did tell me I could use their 10/30 no problem, but i'm uncomfortable with that. My clearances are .029/.033. I just found this GP-1 that is offered in a 15/40 group. They claim in a 383 small block chevy 5hp gain and cooler temps just by changing oil. Either way looks like a good enough oil. Anyone here ever use this stuff? They have my interests.
Last edited by mopar dave; 01/18/20 09:38 AM.
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Re: Driven GP-1 oil
[Re: mopar dave]
#2734127
01/18/20 11:41 AM
01/18/20 11:41 AM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Been running oil thinner than the "experts" say to do forever and zero issues w/similar clearances as you.........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Driven GP-1 oil
[Re: BradH]
#2734141
01/18/20 12:20 PM
01/18/20 12:20 PM
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Joined: Dec 2005
Posts: 12,289 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 12,289
Fulton County, PA
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10w30 Amsoil race oil with clearances as big as yours. Can't be squeamish about oil pressure and you need to pay attention to internal oil leaks and excess oil going places other than the crank.
I even tried some 0w30. Oil pressure was too low.
I think tightening up the clearances a half or 3/4 a thou or so and using 10w30 on a bracket style deal is about right.
Last edited by CMcAllister; 01/18/20 12:35 PM.
If the results don't match the theory, change the theory.
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Re: Driven GP-1 oil
[Re: mopar dave]
#2734205
01/18/20 02:03 PM
01/18/20 02:03 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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You should look for oils that DON'T advertise and spend all their time doing articles for webzines and any other place they can get some advertising time.
If you are buying a synthetic and not paying 20 bucks a quart you are wasting your time. The simple fact is quality oil is expensive. And the companies doing it budget very little for advertisement.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Driven GP-1 oil
[Re: mopar dave]
#2734222
01/18/20 03:10 PM
01/18/20 03:10 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Depends but usually Valvoline crude or sync but recently went with Royal Purple 10w30 just because.....
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Driven GP-1 oil
[Re: mopar dave]
#2734252
01/18/20 04:47 PM
01/18/20 04:47 PM
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Joined: Jan 2003
Posts: 26,279 United Socialist States of Ame...
tboomer
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,279
United Socialist States of Ame...
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Since my car sits and only gets fired up once in a while I was thinking of going back to Rotella 15-40. It will be due for an oil change this spring. Currently has Brad Penn in it.
Need your rear end checked out? Contact Grizzly!!
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Re: Driven GP-1 oil
[Re: mopar dave]
#2734259
01/18/20 05:13 PM
01/18/20 05:13 PM
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Joined: May 2011
Posts: 4,492 northern,Ohio,USA
Clanton
master
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master
Joined: May 2011
Posts: 4,492
northern,Ohio,USA
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With going to a thinner oil do you think about changing the filter to a smaller micron filtering? OMG, another oil thread, yep. I have been looking for a good oil to replace the 15/50 Amsoil I have been using because according to the oil grade/bearing clearance guide I should be using a 10/40 or 15/40 group oil. Amsoil does not offer this group in a racing/flat tappet oil. They did tell me I could use their 10/30 no problem, but i'm uncomfortable with that. My clearances are .029/.033. I just found this GP-1 that is offered in a 15/40 group. They claim in a 383 small block chevy 5hp gain and cooler temps just by changing oil. Either way looks like a good enough oil. Anyone here ever use this stuff? They have my interests.
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Re: Driven GP-1 oil
[Re: mopar dave]
#2734293
01/18/20 07:48 PM
01/18/20 07:48 PM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
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top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
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I think I would have good piece of mind with the 40 grade vs the 30. How much do you think would be gained going from 50 to 30 grade oil. Would really like to know hp differences between the 2. Current oil pressures are 80 cold, 30 hot at idle and 65 hot WOT. Try what you are comfortable with trying and see how it effects the pressure especially at the high rpms. There's a good chance that idle psi drops a little and high rpm pressure increases going to a 15W-40. (when compared with 15W-50 at the same oil temperature) If so, then next change you can try 10W-30 if you want. But if the high rpm pressure drops then of course you don't want to go thinner.
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Re: Driven GP-1 oil
[Re: mopar dave]
#2734308
01/18/20 08:45 PM
01/18/20 08:45 PM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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I use regular, not synthetic, Valvoline 5W20WT in my hot street motors, VR1 10w30Wt in my E85 bracket motor. I like to see at least .0030 on the rods and .0035+ bearing clearances on the mains I've never seen or heard of a rod bearing or main bearing spinning because of to much oil clearances, I have seen that happen with them to tight though
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Driven GP-1 oil
[Re: Cab_Burge]
#2734310
01/18/20 08:48 PM
01/18/20 08:48 PM
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Joined: Jul 2008
Posts: 30,632 Florida STAYcation
IcorkSOAK
Financed his waterbed
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Financed his waterbed
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
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I use regular, not synthetic, Valvoline 5W20WT in my hot street motors, VR1 10w30Wt in my E85 bracket motor. I like to see at least .0030 on the rods and .0035+ bearing clearances on the mains I've never seen or heard of a rod bearing or main bearing spinning because of to much oil clearances, I have seen that happen with them to tight though Only 3 this time ? .. you get TWO credits !
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