I never put oil on the treat for spark plugs, it might cause carbon built up on the treat, better to use anti- sieze.
As for brake fluid DOT # , the higher the number the higher the boiling point.
Racing brake fluid is DOT 5.
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Bud
87 930 Black
86 951 Black
86 944 N/A Red (part car)
87 944 S White
83 944 N/A Black
83 944 N/A White
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