RE: high beams work, low beams won
Here's another thought...we have a 2004 TJ 4.0L
When we bought it, it ran at 210 to 215 degrees. However, once we changed to a synthetic blend engine oil the operating temp dropped under 210...somewhere down to about 200 I'd guess by the guage. Not a significant drop, but it did go down. Gas mileage was not reduced by this change.
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"I don't know why they call this stuff hamburger helper. It does just fine by itself."