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50% STP? #4510068
09/07/17 02:49 PM
09/07/17 02:49 PM
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Corelokt Offline OP
Corelokt  Offline OP
Joined: Sep 2014
Posts: 163
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.
Re: 50% STP? [Re: Corelokt] #4510084
09/07/17 03:01 PM
09/07/17 03:01 PM
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
Fix it so it has proper oil pressure? Then 0% STP


2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver, 5K OCIs.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo, 10-15K OCIs.
Re: 50% STP? [Re: Corelokt] #4510093
09/07/17 03:11 PM
09/07/17 03:11 PM
Joined: Aug 2014
Posts: 504
WA
SnowDrifter Offline
SnowDrifter  Offline
Joined: Aug 2014
Posts: 504
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?


2005 Tahoe - 135k
2003 Forester(the swagger wagon) - Rehomed
1999 Passat - Rehomed
Re: 50% STP? [Re: Corelokt] #4510098
09/07/17 03:19 PM
09/07/17 03:19 PM
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Corelokt Offline OP
Corelokt  Offline OP
Joined: Sep 2014
Posts: 163
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.
Re: 50% STP? [Re: Corelokt] #4510099
09/07/17 03:20 PM
09/07/17 03:20 PM
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Corelokt Offline OP
Corelokt  Offline OP
Joined: Sep 2014
Posts: 163
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.
Re: 50% STP? [Re: Corelokt] #4510108
09/07/17 03:28 PM
09/07/17 03:28 PM
Joined: Jan 2011
Posts: 1,034
Columbus Nebraska
old1 Offline
old1  Offline
Joined: Jan 2011
Posts: 1,034
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
Re: 50% STP? [Re: Corelokt] #4510153
09/07/17 04:24 PM
09/07/17 04:24 PM
Joined: Dec 2002
Posts: 40,860
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 40,860
'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.

Re: 50% STP? [Re: Corelokt] #4510197
09/07/17 05:00 PM
09/07/17 05:00 PM
Joined: Oct 2011
Posts: 5,091
USA
NHGUY Offline
NHGUY  Offline
Joined: Oct 2011
Posts: 5,091
USA
And heaven forbid it gets cold out...

Re: 50% STP? [Re: Corelokt] #4510283
09/07/17 06:41 PM
09/07/17 06:41 PM
Joined: Jun 2011
Posts: 7,056
Mahzurrah!
KCJeep Offline
KCJeep  Offline
Joined: Jun 2011
Posts: 7,056
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 97k - M1 AFE 0w30
12 KIA Sedona 91k - PP HM 10w30
09 Ford Focus 131k - Supertech FS HM 5w30
00 Chev Lumina 201k - Supertech FS HM 5w30
04 Jeep Grand Cherokee gone but not forgotten.
Re: 50% STP? [Re: Corelokt] #4510298
09/07/17 06:56 PM
09/07/17 06:56 PM
Joined: Oct 2004
Posts: 7,968
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 7,968
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), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: 50% STP? [Re: Corelokt] #4510363
09/07/17 08:01 PM
09/07/17 08:01 PM
Joined: Jun 2011
Posts: 619
Florida
chainblu Offline
chainblu  Offline
Joined: Jun 2011
Posts: 619
Florida
I think Lucas (which is a similar product) says you can go up to 25%. So.... I'd say 25%.

Re: 50% STP? [Re: Corelokt] #4510430
09/07/17 09:16 PM
09/07/17 09:16 PM
Joined: Jul 2013
Posts: 1,670
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline
Joined: Jul 2013
Posts: 1,670
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
2014 Toyota Sienna
1983 Chevy K5 350
Re: 50% STP? [Re: Corelokt] #4510731
09/08/17 10:19 AM
09/08/17 10:19 AM
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Corelokt Offline OP
Corelokt  Offline OP
Joined: Sep 2014
Posts: 163
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.
Re: 50% STP? [Re: jhellwig] #4510765
09/08/17 10:56 AM
09/08/17 10:56 AM
Joined: Oct 2004
Posts: 7,968
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 7,968
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), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: 50% STP? [Re: Corelokt] #4510767
09/08/17 10:57 AM
09/08/17 10:57 AM
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Corelokt Offline OP
Corelokt  Offline OP
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Mine is a military take out, all the best except the driver...

Last 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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