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to be honest, I would think it would be safer to change conventional oil every 3k that run synthetic 6k. It would be different if these were racing vehicles or pulling 20k or something but that isn't happening.

so is the best place to go?

well it is the wifes vehicle so I really don't care about hp. I'm just trying to do a few things to get a few more days in between tanks.

well my last Z71 I ran havoline for 176,000 miles before I sold it, so I don't know if I'm hung up on the whole conventional oil sucks thing.

So does synthetic oil really help gas mileage? if so, when you a person switch to it? What is the break in period?

Well I just bought one so I guess I will find out.

so do you all just order these anywhere or where is the best and best priced place to get them?

are you all seeing better gas mileage by switching to sny oil?

Just throwing this out there. My buddy has the 5.3 in a 07 tahoe like ours and he said by putting in a K&N air filter, he picked up 1mpg both on the city and highway. Has anyone else done this. Hell for $50 this can't hurt.

so does this really get you better gas mileage? I have a 07 tahoe with the 5.3 and it doesn't do so hot.