M1 5W/50 | 5,012 | 74 MGB

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Mobil1 5W/50

1974 MGB stock, never rebuilt, using lead substitute



Miles Oil: 5,012

Miles Unit: 90,012

Make up: 5qt





current test fleet average

ALUMINUM 4 5

CHROMIUM 0 1

IRON 18 33

COPPER 36 14

LEAD 51 24

TIN 0 1

MOLYBDENUM 77 31

NICKEL 0 0

MANGANESE 1 1

SILVER 0 0

TITANIUM 0 0

POTASSIUM 224 3

BORON 56 54

SILICON 3 11

SODIUM 11 90

CALCIUM 1111 2020

MAGNESIUM 722 124

PHOSPHORUS 1012 877

ZINC 1283 1041

BARIUM 0 0









SUS Viscosity @ 210°F 78.9

cSt Viscosity @ 100°C 15.25

Flashpoint in °F 375
 
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Looks good! these engines usually live happy lives on a diet of Mineral 20W-50, but the 5W-50 Mobil 1 seems to work great!
The lead is probably mostly from being run on leaded gas.
 
Potassium number is concerning. It may be part of the lead substitute package.

Cool car. How long have you owned it?

Is the 5 quarts of makeup oil due to leaks or usage?
 
Copper and Lead are way more than 2X the average!

I think you may need bearings really soon......
 
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