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91 740T 190k Smoking after change to syn oil. 700

posted by  CW on  Tue Dec 7 05:33 CST 2004
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last visit: Tue Feb 5 13:37 CST 2008
[RELATED]

Hi dobiesan,

That's kind of wierd if it wasn't doing it before the synthetic switch. Maybe the 5 weight portion is too thin. I use Amsoil 10W40 in my 745T and it works great. My turbo is orignial (291K km > ~182K mi), but the engine only has a little over 30K km on it. Maybe the synthetic oil has illustrated some tired valve seals. Not usually a problem on B230FTs that I've seen though. Weird. I'd suggest trying a heavier weight like 15W50 Mobil 1 or 10W40 Amsoil or Redline. Mobil 1 is a fine oil and is better then non-synthetic, but I'd pick Amsoil or Redline over it any day.
--
Chris. Halifax N.S. '91 745Ti, 291K km and '91 745 NA, 385K km.






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