Peugeot 207 208 307 2008 3008. 2010–2015 Peugeot 3008. 2011–2015 Peugeot 508. A very common oil leak on all Peugeot models is from the Rocker cover gasket. Fitted between the top of the cylinder head and the plastic top cover the original seals installed can't cope with the high engine temperature and exposure to oil and almost always fail.