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

posted by  Dick in Falls Church on  Tue Dec 7 09:40 CST 2004
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last visit: Fri Aug 1 10:33 CST 2014
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Are you sure is is 5W-50? The Mobil 1 I've seen is 15W-50.

Is there noticeable oil consumption? If so, then try changing the oil filter and topping off.

Changing to synthetic, or even another brand of non-synthetic, can loosen deposits and clean things up. Dirty oil doesn't seal as well as clean oil, so you might burn some initially. Unless you have existing bad seals or gaskets, consumption should settle down. I'd leave it in there at least a couple thousand more, topping off as needed.






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