I wouldn't worry too much about the red line on the dipstick. It wasn't specifically designed for BMW.... And think about Roboyobo's final hint: "So, i've learned not to worry about it. Just keep occasionally feeding it a little 20w50 mineral oil (not synthetic) and all will be fine." The older type Beemer (2V) wasn't constructed in the age of synthetic oil. The later 4V Beemers are a different story oil-wise.
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Only when we pause to wonder
do we go beyond the limits of our little lives.
(Rod McKuen)
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