We know the stories about gaskets in the engines and some rubber parts. There are videos on youtube with people using AT-205 and how it has helped with gasket issues by conditioning the rubber. Most recently SamCrac "fixing" a V8 turbo BMW smoking oil with AT-205.
My mechanic will only use BMW oil & BMW filters. Any other cars, he uses Mobil1.
I searched around and supposedly BMW oil is Castrol Edge & possibly some Shell oil maybe in Europe. I know how smart BMW is when they made Wintershal fuel with BASF to keep the Paul Rosche M-12/13 in the Brabham BT 52 with the I4 BMW turbo putting out up to 1450 bhp. They know oil and fuel.
I know people beat the "what oil" to use to death. My question is does anyone think Liqui Moly is better for the rubber engine gaskets in the engine. I know Liqui Moly owned by Wurth going way back to Group 5 racing in Germany. They sponsored the Ford Capri Group 5 race team with the 1.75 liter Ford I4 putting out as much as 650 bhp in the mid to late 1970s.
I have done research and supposedly Red Line made by Phillips (66) Petroleum is one of the best but it is expensive followed by Liqui Moly and German Motul. I know Liqui Moly and Motul were and are used in German race cars. The key is the heat from turbos. Oldsmobile had the first turbo though I doubt they sold any. Bob Lutz had them turbocharge the BMW 2002 in 1975 which was followed by Porsche with the 930 in 1975/76.
Anyone have any long term BMW turbo engine stories of doing hundreds of thousands of miles? What oil did you use? How often did you change it? Thanks.