Thanks for your advice!By the way,the Corolla has 182,000 and uses maybe 1qt between 5,000 mile oil changes,the'97 Ranger has 33,000 miles on it,and the'03 Ranger has 8,000 on it.
Thanks again!!
I have 3 different vehicles using 3 different oils.'94 Corolla[10w30],'97 Ranger[5w30],'03 Ranger[5w20].Do you suppose I could go to 5w30 in the Corolla so I won't have to buy so many different oils?