I don’t believe a lot of the above responses were very good answers to this hypothetical question. A whole lot of pontification and word salad and very little choices and reasons going on here today.
If you come from the belief that some of the better 5W20 motor oils you can use, are actually 5W30 oils (towing, desert heat scenario, mountain driving for example), here is my take:
1) Pennzoil Ultra Platinum 5W20. Because it is a thicker 20wt oil. Viscosity @100C is 8.8. GLT base + an additive package designed for SRT engines (if you believe what Shell will tell you).
2) Schaeffer’s 9004 5W20. Viscosity @100C is 8.5-9.15. HTHS of 2.83. NOACK of 7.6. Near 30wt numbers, while still being a 5W20 motor oil.
That’s all. Keep it simple.
If you come from the belief that some of the better 5W20 motor oils you can use, are actually 5W30 oils (towing, desert heat scenario, mountain driving for example), here is my take:
1) Pennzoil Ultra Platinum 5W20. Because it is a thicker 20wt oil. Viscosity @100C is 8.8. GLT base + an additive package designed for SRT engines (if you believe what Shell will tell you).
2) Schaeffer’s 9004 5W20. Viscosity @100C is 8.5-9.15. HTHS of 2.83. NOACK of 7.6. Near 30wt numbers, while still being a 5W20 motor oil.
That’s all. Keep it simple.