its due to water getting into the oil and it makes it into mayonaise basically, clean as much sludge out and do an engine flush and then replace with fresh oil.
This will usually happen if the car has been left to stand or only does very short journeys where engine never gets to operating temperature.
Personally wouldnt bother with straight 30 go for a 15 40 mix and change at regular intervals of 3000 miles or three months
Edited by user
16 years ago
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Reason: Not specified
check out www.durhamdubbers.co.uk great for resto threads 🙂