rpn453, all I have is a humble little Saturn Ion. I don't own a $100,000.00 MB or BMW.
Motor oil improves all the time. The quality of present day motor oil is far beyond what the quality was just a few years ago. And motor oil does have a shelf life. Pennzoil in a PM Magazine said that the shelf life of unopened motor oil was at least 18 months.
I would use SL rated oil in any car or truck I owned, regardless of the age of that vehicle. How expensive is motor oil, anyway? Conventional motor oil is very affordable. Who cannot afford Chevron motor oil that may be the best conventional (based on VOAs and UOAs) and costs about a dollar a quart?
Some people in the post here talk about how their car or truck required only SF oil, or SG, or whatever. Just because your vehicle required SF or SG oil when it came out, does not mean that you cannot use SL rated oil. In fact, you would probably have a hard time finding SF or SG rated oil, unless it had been sitting in a garage for several years. Do you really want to use motor oil that has been sitting in some forgotten corner of a garage for 5, 10, 15 years? Personally, I will spend the one dollar a quart on the fresh motor oil. Remember, motor oil DOES HAVE A SHELF LIFE!
Even if you can get that 10 year old motor oil sitting in somebody's garage for free, do you really want to put that in your engine?
Some people at this site act like 5-6 dollars worth of motor oil is going to break the bank for them. Well, how do you afford the car insurance if you cannot afford 5-6 dollars worth of motor oil?
Compared to the cost of a new or rebuilt or remanufactured engine, motor oil at just about any price is free! Spending four dollars a quart for Mobil 1 is cheap compared to a new engine!