Have an oil leak on the exhaust side of #6 cylinder on my 91 M50. Will be replacing the 5 yr old vlave cover gasket(s) which might be the source of leak. In the previous posts Goerge mentioned that some people will re-tighten the head bolts ( he recommends against it). Do not want to replace the head gasket (major job) and was looking for recommendations. Should I retorque the head bolts according to the sequence and torque specified in Bently's.