Ok, one last dumb question. If I am using 10W30 now, would SAE30 be the same viscosity? I don't drive it in the winter. I bring it home in March/April and park it in October/November depending on when I can get it to the storage unit. It sits all winter and isn't started. Wife stopped at O'Reilly to look for me and they have SAE30 and 20W50. Site shows 10W30, but they don't carry it. Amazon has it for $34.77 for 6 quarts.
10W30 and SAE 30 are not the same, but you should be fine running the SAE 30.
They are exactly the same, a 30 grade oil. The difference is as ambient temp drops, the 10w30 will act like a 10 grade oil. As the oil temp goes up, the 10w30 will GAIN viscosity.
There is no reason to ever use a single grade engine oil. Ever.
