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Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI #4591756
12/02/17 08:34 AM
12/02/17 08:34 AM
Joined: Oct 2005
Posts: 4,394
Atlanta
DuckRyder Offline OP
DuckRyder  Offline OP
Joined: Oct 2005
Posts: 4,394
Atlanta


HMM...

Couple of things, the indicated mileage is estimated with exception of the 198 miles last time and the mileages on this run and are since the engine build. I had misplaced the records but have since found them.

I strongly suspect the fuel pump is leaking internally as well as externally and that there is more than a trace of fuel in this sample, going to fix that.

The advice to listen for a ticking sound it a little amusing since it is a solid roller... It doesn’t make any abnormal noise and runs strong.

All 338 miles of this run was back and forth to the landfill with yard debris and several loads (like 2 tons worth) of egg rock...


Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: DuckRyder] #4591768
12/02/17 08:47 AM
12/02/17 08:47 AM
Joined: Oct 2004
Posts: 7,967
Cincinnati, OH, USA
bullwinkle Online confused
bullwinkle  Online Confused
Joined: Oct 2004
Posts: 7,967
Cincinnati, OH, USA
Those are some pretty high lead & copper numbers-I hope you're not losing a bearing.


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: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: DuckRyder] #4591775
12/02/17 08:50 AM
12/02/17 08:50 AM
Joined: May 2010
Posts: 9,046
North Carolina
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,046
North Carolina
Were the cam bearings replaced at rebuild? If so that explains the copper. Sometimes it takes a while to see them come down.


13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: DuckRyder] #4591805
12/02/17 09:15 AM
12/02/17 09:15 AM
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
It dont like mobil-1. I would try a dino such as pennzoil or castrol. 10w40 or a 15w40.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: spasm3] #4591824
12/02/17 09:35 AM
12/02/17 09:35 AM
Joined: Oct 2005
Posts: 4,394
Atlanta
DuckRyder Offline OP
DuckRyder  Offline OP
Joined: Oct 2005
Posts: 4,394
Atlanta
Originally Posted By: bullwinkle
Those are some pretty high lead & copper numbers-I hope you're not losing a bearing.


Me too, I guess if it is then I’ll just change them, if it wiped the crank - I guess that would be as good of excuse as any to turn it into a 445.

Originally Posted By: spasm3
Were the cam bearings replaced at rebuild? If so that explains the copper. Sometimes it takes a while to see them come down.


They were, in fact nearly everything was replaced. The block and head casting were reused and a 390 rotating assembly was reconditioned, It makes 10.6:1 compression, cobra jet valves, crower solid roller...

I’ve got to go back and find the info on the bearings, they were either Clevite or Speed Pro “High Performance”.


Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: DuckRyder] #4591840
12/02/17 09:52 AM
12/02/17 09:52 AM
Joined: May 2017
Posts: 146
New York Queens
Ram02 Offline
Ram02  Offline
Joined: May 2017
Posts: 146
New York Queens
Try Valvoline 10w30 you might get a better UOA


2013 Malibu 2LT M1 5w30
2013 Accord Sport M1 AP 0w20
Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: Ram02] #4591850
12/02/17 09:58 AM
12/02/17 09:58 AM
Joined: Sep 2010
Posts: 6,988
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 6,988
Texas
Might be all mechanical but a 40 grade would be worth a go …

Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: DuckRyder] #4591925
12/02/17 11:25 AM
12/02/17 11:25 AM
Joined: Oct 2004
Posts: 7,967
Cincinnati, OH, USA
bullwinkle Online confused
bullwinkle  Online Confused
Joined: Oct 2004
Posts: 7,967
Cincinnati, OH, USA
My only experience with the FE big blocks was in my brother's old '68 F-100 Ranger, a 360. We rebuilt it and ran VWB 10W40 (this was back in the day, I'm sure SE or SF, and it ran until the body finished rusting off of it. I'm with the guys above, and I wouldn't think that even VR1 20W50 and a shot of LiquiMoly MOS2 wouldn't be a bad idea-the oils back in those days were pretty loaded with 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: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: Chris142] #4591943
12/02/17 11:57 AM
12/02/17 11:57 AM
Joined: Oct 2017
Posts: 434
Vermont
littleant Offline
littleant  Offline
Joined: Oct 2017
Posts: 434
Vermont
+1 Go to a dino
Originally Posted By: Chris142
It dont like mobil-1. I would try a dino such as pennzoil or castrol. 10w40 or a 15w40.


I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0
Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: DuckRyder] #4592072
12/02/17 02:15 PM
12/02/17 02:15 PM
Joined: Dec 2006
Posts: 18,620
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline
Joined: Dec 2006
Posts: 18,620
Dallas,Tx USA
I'm with the other posters,try a fill of PYB or QSAD.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W20

Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: DuckRyder] #4592289
12/02/17 06:53 PM
12/02/17 06:53 PM
Joined: Oct 2005
Posts: 4,394
Atlanta
DuckRyder Offline OP
DuckRyder  Offline OP
Joined: Oct 2005
Posts: 4,394
Atlanta
Are you guys looking at the dates? I’m not inclined to move away from Mobil, though I did consider putting 10/40HM in it...

The bearing clearances are relatively tight on it and it is full roller (Roller cam, Roller rockers, roller thrust bearing on the cam... so it really shouldn’t have any “Old engine” requirements.

One thing I did remember is that two of the rods in it appear to be copper plated, this isn’t particularly uncommon though no one has ever been able to really explain the reason, at least not that I recall. The beams on the rods were ground and polished, everything was shot peened as well... The pistons are forged flat top Speed Pro with skirt coating.


Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
Re: Mobil 1 10W/30 EP 338mi 1972 F100 RangerXLT 390CI [Re: DuckRyder] #4592330
12/02/17 07:50 PM
12/02/17 07:50 PM
Joined: Oct 2017
Posts: 633
Georgia
MParr Offline
MParr  Offline
Joined: Oct 2017
Posts: 633
Georgia
Have you considered a 10W30 or 10W40 blend? It may be a little early for an HM oil.
As far as fuel dilution, installing an external electric fuel pump may solve that problem.

Last edited by MParr; 12/02/17 07:52 PM.

2013 KIA Optima EX 2.4L. Now: QSUD 5W30 & STP S2808ML
2017 Ford Escape SE 2.0T Now: Pennzoil Platinum 5W30 & Motorcraft 910s

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