Differential Oil

1950 - 1952, M38, questions, discussions, regarding anything related to the M38.
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JMZ421
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Differential Oil

Post by JMZ421 » Thu May 12, 2022 3:01 am

What brand and weight of differential oil are you using in the M38? I know what the manual states, Thanks, John


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dpcd67
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Re: Differential Oil

Post by dpcd67 » Thu May 12, 2022 7:27 am

80W90. GL5 from Walmart. Cheapest brand.
Now, do NOT use this in your transmission or transfer case; you must use GL4 or below due to yellow metals, and migration.
Note; they just got re-stocked with Rotella 15W40 diesel oil for your engine. That is all I use.
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Kurt Lesser
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Re: Differential Oil

Post by Kurt Lesser » Thu May 12, 2022 12:47 pm

If your seals leak a little bit due to wear use 90-140 weight oil in the differentials to fix the problem. They will get the lube they need and the oil seepage will stop.
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Re: Differential Oil

Post by Von Loon » Fri May 13, 2022 1:14 am

Miller's Vintage gear oil GL1
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1952 M38

JMZ421
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Re: Differential Oil

Post by JMZ421 » Sat May 14, 2022 6:38 am

Thank you, John


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