If your looking at the reservoir check the o-ring in the cap. Mine was hard with age and it caused it to seep or leave a film over everything. New o-ring and it all stays clean.

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2003 X5 4.6is Estoril Blue
2005 Infiniti G35X
1972 Datsun 240Z
1991 Isuzu Impulse XS Sold
1972 Fiat 850 Spyder Donated
1972 Datsun 240Z Sold
1972 Datsun 510 Sold