my 1997 BMW 528i starts and runs 5-10 mins then dies and wont restart til it cools
Scan the vehicle and note codes stored. Report back with the trouble codes stored and will be able to be of more help.
Could be a number of things: does it overheat before it dies? do you notice a drop in the level of coolant even though it's not leaking anywhere? - these could point to a fissure in the cylinder head gasket - replace the gasket to fix. Run a compression test and make sure you have the right values (go to a car service for this). A friend had a similar issue with a diesel BMW and it was the camshaft sensor. Could be a number of things, so it's best to go a service and see.
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