Originally Posted By: Oregoonian
I tried doing the 20w thing to see what would happen, but I've gone back to 5w30. I wouldn't do it in my car if I was in the heat of a Texas summer(quote)
Your engine will run 'cooler' with 20w....and hotter with 30w....
Lighter oils dissapate heat faster....go for it!
Not having an oil temp gauge, I couldn't say whether it did or didn't. I would doubt, however, if it made much difference.
I sure didn't baby it when I drove it. I made sure it was a good test. The engine revved more freely, the water temp was the same. But I didn't think it was worth it at 270k miles. I have to make sure it runs until the wife's car is paid off and I can get something else. The rust is really taking its toll, though the engine is still kicking hard.