I have a 93 Ranger 3.0 V6 with 187,000 miles. I have always used 5W-30 oil like the manual says. It uses about a quart between 4-5K oil changes. Would you change to something different like 10W-30 or 10W-40? I live in Texas and it doesn't get cold much, but rather warm
in the summer. Also I have a 01 Explorer that says 5W-30 also. It doesn't use any between changes same interval. Should I change it? Also have a 98 Ranger 4 banger, also use 5W-30, should I change it? 98 is daughters, 93 is son's, 01 is better halfs. I drive 93 Subaru and use 10W-30 as its manual says. Sometimes feel like a fleet manager trying to keep up with all of them.