V8 Quattro V8-3562cc 3.6L DOHC (PT) (1990)
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Remove air cleaner housing to inspect described area (arrow).
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Remove right front wheel.
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Using a crowfoot with a long extension an a swivel head, remove the connector union from oil pressure line and transmission housing.
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Clean threads of connector union and reinstall it with removable "Loctite" or equivalent (locally available).
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Tighten connector union to 35 Nm (26 ft lb).
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Reinstall oil pressure line.
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Check for leaks.
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Reinstall air cleaner housing and right front wheel.