Mobil 1 15W50, 4600 miles, 1976 MG B

[craigq]

Vehicle History
Dad's toy. The engine was rebuilt [hot-tank, cylinders bored, new pistons/rings etc.]
at 97358 miles on the ODO so I've reported the miles on engine as 7176, and miles on
vehicle as 104534.

OCI
This oil was in use for at least 2 years. The ODO definitely rolled over 00000 with
this oil sample in the sump, so there's at least 4600 miles on it. It might have been
Mobil 1 TriSyn SL as that's what I found in the trunk for top-up oil, of which 200mL
was used for top-up. There was at least one change before this was run.

My own comments : Lead is bad, iron is high. Silicon was suprisingly low considering what little faith I had in the air filter setup.

code:

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Sample Date 5/14/2006

Analysis Date 5/26/2006

Lab WearCheck Canada





***Vehicle ID***

Make MG

Model B

Year 1976

Engine 18V672Z 1.8L I4

Miles on Engine 7176

Miles on Vehicle 104534





***Oil Identification***

Oil Brand Mobil

Oil Series Mobil 1

Oil SAE J300 15W50

API SX SL

Miles on Oil 4600

Months In Service 24





***Elements***

Antimony Sb NR

Cadmium Cd NR

Vanadium V 0.2

Aluminum Al 3.6

Chromium Cr 6.2

Iron Fe 28

Copper Cu 6.2

Lead Pb 75

Tin Sn 0.9

Molybdenum Mo 73

Nickel 0

Manganese Mn 33

Silver Ag 0.6

Titanium Ti 0.1

Potassium K 1.3

Boron B 147

Silicon Si 8.4

Sodium Na 17

Calcium Ca 3105

Magnesium Mg 63

Phosporus P 1175

Zinc Zn 1387

Sulfur 2630

Barium Ba 0.6





***Viscosity***

cST @ 100 C 14.9

SUS @ 210 F NR





***Misc***

Flashpoint (F) NR

Fuel %
Antifreeze % NR

Water %
Insolubles % NR

Sulfur 16

Oxidation 33

Nitration 15

ZDDP 18

TBN NR

TAN 3.09

Ferrous Debris NR

Fuel Soot % 0

Glycol NR

ISO Code NR

Additives None

URL NR

Notes Lab reports wear rates are normal,

and to resample at the next service interval to monitor.

Location Ottawa, ON, CAN





***Filters used***

Air Filter UNI Pancake Filters

Oil Filter Motomaster Formula 1 F1-43





***Particle Count***

>2 micron NR

>5 micron NR

>10 micron NR

>15 micron NR

>25 micron NR

>50 micron NR

>100 micron NR

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EDIT: I forgot, the first time on the road after the rebuild was summer 2002.

[ May 18, 2006, 06:46 PM: Message edited by: craigq ]

 

[Al]

Iron+chrome=rings.

You might want to have Terry check this one out.

 

[ekpolk]

Wow, now here's one we don't see every day -- a 76 MGB. I agree with Al, the consult with Terry Dyson is probably a good idea, if for no other reason than it's going to be really hard to pick through our data here and find meaningful comparative info. My first impression, and beware, it's no more than an amateur's impression, is that this result may not be so bad, given the relatively non-standard facts (long time in service, recent rebuild, "ancient" design, and so forth). Keep after it, and please do let us know how it works out.

 

[Tim]

14.9 visc for Mobil 1 15W-50? Something is wrong there.