United Oil Company, Inc. (P), brought an action in indemnity and contribution to recover the $820,098.89, in settlement of a product liability claim against P. P sued Rohm & Haas (D1) as the manufacturer of dyes and Parts Associates (D) as the distributor of a brake cleaner. D's expert, claims that they xylene and ethyl benzene caused liver disease. P claims that Ds are liable under a failure to properly warn about the dangers of liver damage, from exposure to the chemicals in Ds' products. P asserts that Ds' knowledge about these dangers is ... relevant to the failure to warn and information concerning any other claims or lawsuits, is relevant to the issue of causation.