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I haven't heard of Neutra, but my '86 240 sedan with 215,000 miles is ready for its second oil change in the Auto-RX engine cleaning process. I think I will remove the valve cover to see what the cam looks like. I can tell you that the first half bottle made the fresh oil really black after the initial 500 mile oil change the maker prescribes.
Now have comnpleted the 1,500 mile run with fresh oil (no Auto-RX).
It is a long process like this...start with new oil and filter, add Auto-RX for 500 miles, chande oil/filter, run just oil for 1500 miles, etc.
We'll see.
If it works, I'll try it in my '89 740tic which I just got running after three months :>)
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1989 740Ti 1986 240DL 1984 244GL
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