FYI about OE Benz Gasket sealer .To hopefully help some others when resealing automobile parts. I purchased Elring # 461.680 AFD 2018 Anaerobic sealer 75 ml for 36. ( clear red gel ) which appears to be the same as oe Benz sealer.I used it to reseal my m272 engine when torn down to repair the know problems. It was not until after purchase and use that I was able to find information on Permatex 51813 ,50 ml is sold at a much lower price and appears to be the same product for less then half the price . 300 ml can be purchased for 45.This sealer is recommended for many metal to metal sealing procedures VC covers , pans , Timing covers. It appears that this one of the best products at this time for sealing many metal to metal contact surfaces .Also used for heavy duty industrial use. I was glad to find other posts recommending pk#51813 on these forms . There is a older benz gasket sealer (orange) that was a different product sold under p # 002-989-47-20-10 It may now be the same as 51813 or it may have been superseded to a different part number from Benz. If some one one can answer this ? Please Due.