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#4510068 - 09/07/17 02:49 PM 50% STP?
Corelokt Offline


Registered: 09/12/14
Posts: 163
Loc: Tug Hill, NY
What's the heaviest percentage of STP I can run with 15-40 oil in a 6.5 diesel with very low oil pressure?
_________________________
86 CUCV. 6.5L. Level-3 4L80. NP205. 9-16 14 ply tires, HX35/40 turbo. WMI. 5" exh. ARP studs heads & crank. Cooling upgrades. Rattle can camo.

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#4510084 - 09/07/17 03:01 PM Re: 50% STP? [Re: Corelokt]
dogememe Online   content


Registered: 04/15/17
Posts: 605
Loc: SF BAY AREA, CA
Fix it so it has proper oil pressure? Then 0% STP
_________________________
2007 Ford Crown Vic P71 4.6 ~124K Miles, SynPower 5W-30, Royal Purple.
2010 Ford Escape 2.5 ~70K Miles, SynPower 5W-30, Wix.
1997 Chevy Suburban 5.7 ~214K Miles, O'Reilly FSHM, MicroGard.

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#4510093 - 09/07/17 03:11 PM Re: 50% STP? [Re: Corelokt]
SnowDrifter Offline


Registered: 08/24/14
Posts: 391
Loc: WA
Do you know why it doesn't have good oil pressure?

STP might be a stop gap measure if you have a bearing that's shot. but if it's caused by something like a pickup tube issue or a stuck bypass valve on the oil pump, thick oil will make the issue far worse. You won't have hardly any flow.


What's your oil pressure anyway? How did you diagnose the issue?

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#4510098 - 09/07/17 03:19 PM Re: 50% STP? [Re: Corelokt]
Corelokt Offline


Registered: 09/12/14
Posts: 163
Loc: Tug Hill, NY
Yes, cam bearings. In a 6.5 the valley is closed and entails pulling the motor, turning it upside down and maybe crank removal. Water pump, timing cover, both alt brackets, steering pump bracket... Not happening anytime soon.
_________________________
86 CUCV. 6.5L. Level-3 4L80. NP205. 9-16 14 ply tires, HX35/40 turbo. WMI. 5" exh. ARP studs heads & crank. Cooling upgrades. Rattle can camo.

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#4510099 - 09/07/17 03:20 PM Re: 50% STP? [Re: Corelokt]
Corelokt Offline


Registered: 09/12/14
Posts: 163
Loc: Tug Hill, NY
So, back to my question, how high of a percentage can it be run at?
_________________________
86 CUCV. 6.5L. Level-3 4L80. NP205. 9-16 14 ply tires, HX35/40 turbo. WMI. 5" exh. ARP studs heads & crank. Cooling upgrades. Rattle can camo.

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#4510108 - 09/07/17 03:28 PM Re: 50% STP? [Re: Corelokt]
old1 Online   content


Registered: 01/04/11
Posts: 1001
Loc: Columbus Nebraska
I have used STP in a lot of worn engines, but I don't think I would go much above 20% in 15/40 oil. Also depends on the ambient temp.

come winter, not so much.
_________________________
2017 Nissan Frontier 4.0 5w30
1965 Mustang 200 c/4 10w30 QS defy
1964 Ford Ranchero 302 c/4 15/40 Delo
1929 ford model A No filters, and 15/40 oil

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#4510153 - 09/07/17 04:24 PM Re: 50% STP? [Re: Corelokt]
Shannow Offline


Registered: 12/12/02
Posts: 39858
Loc: 'Stralia
If the below pic accurately represents the oiling system, then I'd be loathe to do it...looks like the mains are the last to get oil, around the backs (hopefully) of the cam bearings...then the mains feed the big ends.



Go 20W50, see if it helps, then thicken a little from there if you think it's helping...in incrememnts. if you like.

But I think going thicker than that will hasten the demise of other componentry.

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#4510197 - 09/07/17 05:00 PM Re: 50% STP? [Re: Corelokt]
NHGUY Offline


Registered: 10/09/11
Posts: 5043
Loc: USA
And heaven forbid it gets cold out...

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#4510283 - 09/07/17 06:41 PM Re: 50% STP? [Re: Corelokt]
KCJeep Offline


Registered: 06/30/11
Posts: 6998
Loc: Mahzurrah!
What is the total oil capacity. I would not hesitate to run (and have) at least 1 full quart (2 bottles) but would be a bit careful after that.

STP is old school VII...I have experienced easier starts with my cranky Jeep with STP in the sump. When I was a kid every oil change got a can of STP, and we were using 10w40 year round in South Dakota! Brrrr......
_________________________
09 Lincoln MKZ AWD 91k - M1 AFE 0w30
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00 Chevy Lumina 195k - Supertech FS HM 5w30
04 Jeep Grand Cherokee gone but not forgotten...

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#4510298 - 09/07/17 06:56 PM Re: 50% STP? [Re: Corelokt]
bullwinkle Offline


Registered: 10/09/04
Posts: 7667
Loc: Cincinnati, OH, USA
I have to ask-have you put a mechanical pressure gauge on it? The factory setup isn't very accurate, the senders aren't the greatest-I'm on my 3rd AC Delco one on my '93 6.2. I've put lots of non-diesel rated oils in both my 6.2 & 7.3 (although they were usually at least CF)-might be time for some Delo 400 straight 50-if you can find it.
_________________________
06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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#4510363 - 09/07/17 08:01 PM Re: 50% STP? [Re: Corelokt]
chainblu Offline


Registered: 06/26/11
Posts: 568
Loc: Florida
I think Lucas (which is a similar product) says you can go up to 25%. So.... I'd say 25%.

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#4510430 - 09/07/17 09:16 PM Re: 50% STP? [Re: Corelokt]
jhellwig Offline


Registered: 07/01/13
Posts: 1541
Loc: Ottumwa, Iowa
How did you manage to take out a cam bearing? And how do you know it's a cam bearing? Are you sure it isn't cracked from a main into a galley?

The 6.5/6.2 was never a robust motor even in the later versions. I think I read even the last 6.5s in the humvees had issues dispite the block improvements.
_________________________
Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2008 Chevy Suburban 5.3
1983 Chevy K5 350

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#4510731 - 09/08/17 10:19 AM Re: 50% STP? [Re: Corelokt]
Corelokt Offline


Registered: 09/12/14
Posts: 163
Loc: Tug Hill, NY
I have an optimizer block, pulled it and did crank bearings. They actually weren't bad, so reassembled. I've tried 3 manual gauges. I lost the oil going down the road. It's running the high volume pump. I put a new one in. What's left is cam bearings.
_________________________
86 CUCV. 6.5L. Level-3 4L80. NP205. 9-16 14 ply tires, HX35/40 turbo. WMI. 5" exh. ARP studs heads & crank. Cooling upgrades. Rattle can camo.

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#4510765 - 09/08/17 10:56 AM Re: 50% STP? [Re: jhellwig]
bullwinkle Offline


Registered: 10/09/04
Posts: 7667
Loc: Cincinnati, OH, USA
Originally Posted By: jhellwig
How did you manage to take out a cam bearing? And how do you know it's a cam bearing? Are you sure it isn't cracked from a main into a galley?

The 6.5/6.2 was never a robust motor even in the later versions. I think I read even the last 6.5s in the humvees had issues dispite the block improvements.
The Optimizer isn't a bad engine, especially if it has the forged crankshaft (original GM was nodular iron-crack prone)-I've had two 599 block 6.2s, a '92 & the '93 in my sig-the '92 actually made it to 300K, the '93 is now at 160K, they had the beefed up 6.5 block with the smaller 6.2 bore. If those darned forged cranks weren't $1000+...
_________________________
06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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#4510767 - 09/08/17 10:57 AM Re: 50% STP? [Re: Corelokt]
Corelokt Offline


Registered: 09/12/14
Posts: 163
Loc: Tug Hill, NY
Mine is a military take out, all the best except the driver...


Edited by Corelokt (09/08/17 10:58 AM)
_________________________
86 CUCV. 6.5L. Level-3 4L80. NP205. 9-16 14 ply tires, HX35/40 turbo. WMI. 5" exh. ARP studs heads & crank. Cooling upgrades. Rattle can camo.

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