I am happy with 10-40, but the previous owner had 5-30w all along inclusing at dealers. (???). I guess if you are going to be hard on the engine like a big load towing you can go with 15-50W.
But I stick to 10-40W year round. i dont really care much on brands on my car cose I change the oil no later than 3500 miles.
I have used mobil, exxon, Amoco but never an unknown brand.

If you are planning to change the oil, be careful about the vacuum lines in the vicinity of the filter( assuming you have 123, 1985 or similar car). Make sure you dont knock them loose. or you can have problems ranging from no shutoff of engine to crazy door locks. just a note of precaution.
MVK

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One penny saved is three penny earned.

1985 300D Turbo 179,000miles