It only wines under acceleration after 50+ mph. When I let off the gas,there's no whine. I had a guy who's a tribologist tell me the thicker oil would be good for it. I just wonder if the 75w140 would be bad for it at all? If I try it,I'll go with the Nissan OEM 75w140 synthetic (I can get a really good deal on it). Nissan recently issued a TSB stating to use that fluid in all Nissan vehicles (although our cars being 20+ years old,I don't know how relevant that TSB is to our cars).