gathermewool
Site Donor 2023
Originally Posted By: c3po
Originally Posted By: gathermewool
So if your motor doesn't fail it must be working? I keep reading things like "it runs quieter," and how it performs, "extra cleaning." Are you guys able to quantify these statements? I know some have pulled their valve covers, but how is that an indication of cleaning? After a new-to-you vehicle's first couple of OCI was there still sludge that only MMO eventually got rid of?
I fell for MMO in the gas tank, and used it for 4-5 fill-ups. Gas mileage didn't change, and my fuel pump is still pretty noisy. It went away for fuel fill up number two and three, but came back - with MMO still being used, mind you - for tanks four and five. I guess I would have assumed it was MMO that quieted the pump if I had stopped using after fill up number 3, but the reality is that MMO didn't do anything except maybe lower my octane a little.
I guess I'm not saying I don't think MMO might be doing something, but for the majority of us it serves no purpose. Almost all of what people write is either butt dyno effects or purely peace-of-mind assumptions of what it's doing.
Did you ever let your gas tank go below a 1/4th of a tank.
Yep, but the gauge on the 97 LGT isn't very accurate - It's a 15.9 gallon tank, but most I've been able to pump in is 12.5 gallons. Other more daring LGT owners have driven well past the E indication until the low-fuel light finally came on - the light seemed to correspond to about 14 gallons.
I've pulled the sending unit and pump with less than half a tank and the pump was fully submerged. I think it's actually the pump bracket vibrating against the tank, but I can't prove it - it comes and goes, from near-non-existent to pretty [censored] loud. :/
As far as MMO: again, I'm not against it. I'm actually looking to try it on a friend's new-to-them motor that's making all sorts of lifter noise. I'm just trying to make an informed decision before I try things out. You say he ran two OCI, totalling 7000 miles, but what were his OCI like before that, and with what oil? Was compression down? Burning oil? These things would indicate improvement, not something seen through an oil fill hole. FWIW, I've had weeks straight in the winter where my Subie will sound like poop when first started. Regardless of whether it's colder or warmer, it'll subsequently randomly start and sound normally for another couple of weeks. MMDV : P
Originally Posted By: gathermewool
So if your motor doesn't fail it must be working? I keep reading things like "it runs quieter," and how it performs, "extra cleaning." Are you guys able to quantify these statements? I know some have pulled their valve covers, but how is that an indication of cleaning? After a new-to-you vehicle's first couple of OCI was there still sludge that only MMO eventually got rid of?
I fell for MMO in the gas tank, and used it for 4-5 fill-ups. Gas mileage didn't change, and my fuel pump is still pretty noisy. It went away for fuel fill up number two and three, but came back - with MMO still being used, mind you - for tanks four and five. I guess I would have assumed it was MMO that quieted the pump if I had stopped using after fill up number 3, but the reality is that MMO didn't do anything except maybe lower my octane a little.
I guess I'm not saying I don't think MMO might be doing something, but for the majority of us it serves no purpose. Almost all of what people write is either butt dyno effects or purely peace-of-mind assumptions of what it's doing.
Did you ever let your gas tank go below a 1/4th of a tank.
Yep, but the gauge on the 97 LGT isn't very accurate - It's a 15.9 gallon tank, but most I've been able to pump in is 12.5 gallons. Other more daring LGT owners have driven well past the E indication until the low-fuel light finally came on - the light seemed to correspond to about 14 gallons.
I've pulled the sending unit and pump with less than half a tank and the pump was fully submerged. I think it's actually the pump bracket vibrating against the tank, but I can't prove it - it comes and goes, from near-non-existent to pretty [censored] loud. :/
As far as MMO: again, I'm not against it. I'm actually looking to try it on a friend's new-to-them motor that's making all sorts of lifter noise. I'm just trying to make an informed decision before I try things out. You say he ran two OCI, totalling 7000 miles, but what were his OCI like before that, and with what oil? Was compression down? Burning oil? These things would indicate improvement, not something seen through an oil fill hole. FWIW, I've had weeks straight in the winter where my Subie will sound like poop when first started. Regardless of whether it's colder or warmer, it'll subsequently randomly start and sound normally for another couple of weeks. MMDV : P
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