I've ran alot of oils. Ran Schaeffer's for 3 straight oil changes and had nothing but stiction issues with this oil. Talked to others who ran it and they had the same issues. Changed to either Valvoline or Amsoil and no more stiction. Not sure if i'll ever use Schaeffer's again. In my opinion...i don't believe Schaeffer's is the best oil. Just use what the engine likes more.
Same here, only the Schaeffer's lasted 1,000 miles in my motor before I changed it out.
My injectors were already showing signs of sticking on cold morning, so that summer I decided to make the jump to synthetic, after some research Schaeffer's looked like a great choice. Well I put it in, and no more than 30seconds, with an already warm motor (oil temp gauge showed 100* with the new oil) I had lopey idle and lower power every time the motor got started cold. and this was with overnight temps only getting into the 70's. Once the oil got over 130* it smoothed right out. After 1,000 miles I changed it out for the valvoline 15w40 the truck had all its life with no change, eventually it got 6 new injectors, which were inevitable, but not till next winter.
I will say with the synthetic in the truck it was MUCH quieter at idle and sounded a touch smoother too, but at the higher cost, and the bad experience I had, for the next 80k I have continued with my valvoline 15w40 and have had no problems. Truck now has 180k on it with 2 original injectors, and 6 injectors with 90k on them, original turbo and one oil cooler changed at 113k
