We’ve done articles in the past explaining what types of engine oil to use in Citroëns and why, for air-cooled engines in particular, you want to use an oil that contains ZDDP (Zinc dialkyldithiophosphate) for anti-wear protection and to minimize lubricant breakdown. Hopefully, all is well with your engine, but if you are having issues or just wondering how healthy your engine is, we tell you how to address that.