GL4 / GL5
Interesting that you can find users saying to only use GL5 and others GL4.
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The OEM oil in my car was / is GL4.
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Redline says GL-5 will work and protects better. My thoughts are that GL-5 is a better diff oil but could end up being corrosive if subjected to higher temps and that is why BMW went GL-4.
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OEM fluid is stupid expensive.
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