Dennis wrote: > Your point is why I recommend the products that go to a 40 upper weight. This will carry those warm days and extended highway travels. During cold weather, the coolant and oil will generally stay at slightly lower temperatures. The 5w and 10w -30 can be a problem as the weather warms and extended high speed trips are made. Dennis: In the 60's we ran 20 in the winter (sometimes 10) and 30 in the summer in my splitties, before multi-grade oils. I don't remember if there even was a 40 weight. Now there are x-40s and x-50s that are recommended and x-30 not recommended. We drove on the new Interstates at 70+ and it was just as hot then in Nevada and New Mexico. We'd get 45,000 miles on the #3 exhaust valve and 75,000 or so on the bottom end. What's changed since those days when 30W was fine for summer? (Besides $50,000 splitties and me getting old....) Richard Boulder |
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