Re: Difference in mpg & reliability between a 4.6 & a 3.8 ?
Thanks, that is good info. From what i can see, there is less than 2 mpg difference between the 3.8 and the 4.6. I had a 3.8 v6 in a 94 sable. I suspected the head gasket was leaking. Rather than be honest with me, local ford dealer said... we charge $100.00 to evaluate your engine. If the head gasket is defective, you will not be liable for the $100. That sounded a bit shady to me, so I said, fine check the engine. the service manager came back and said, yep yours is leaking... we will cover it. I went back and talked with the mechanic... he said that all the 3.8's had bad head-gaskets. The service manager was using the $100. evaluation charge, to keep everyone with a 3.8 motor, from demanding a warranty repair. As far as the engine, i never had anymore trouble out of the 3.8, it seemed like a pretty stout motor. My brother had a 3.0 in his taurus, both engines made the same Hp, but the 3.8 had another 100 lbs of TQ. made a huge difference in performance; however, the 3.0 motor seemed to have much less repair issues. Unfortunately, the transmission in my car, was not as strong as the motor... I was under the impression that most of the head gasket issues had been fixed by 97, however... i still find forums where owners with 97 models, have failed head gaskets. I suspect, the ones that were not replaced under warrranty, may be the ones that are now failing, usually at or after the 100,000 mile mark. Best i remember, the head gasket job on a taurus / sable (front wheel drive) was about $2000.00 if not repaired under warranty. I wonder if the 3.8 head gasket failure, would be more than the 4.6 intake swap/repair? i agree, you can get good ones & bad ones regardless of which motor i choose... but I like to go with the one that has the best probability of success... lol