Synthetic oil is always best but there are some engineering reports that suggest that you not change from traditional oil if the vehicle has more than 50,000 miles on it. If you decide to not use a synthetic oil, I'd stay with any of the Pennsylvania grade motor oils. Also, look for the engineering seals on the label. For use in an older engine, select an oil VISCOSITY that does not allow the oil pressure light to come on or the oil pressure gauge to drop too low. You can go with a slightly thinner (lower VIS) oil during the winter to help with starting. I'd start with a summer: 20 W 40, Winter, 10 W 30. If that is too thin for your engine, go up a little in the numbers. If oil pressure is low, try Kendall brand oil. It tends to increase your oil pressure.
What are the advantages of stress interview?
Why the story entitled origin of fair complexion and fair hair?
Ano ang kahulugan ng iskolarling pagpapahayag?
What is a classified data spill or negligent discharge of classified information?
Ano ang papel na ginagampanan ng mga impormasyong ito sa mapa o sa globo?