quote:I drained dino oil out of a motorcycle (10yrs ago) and filled it with M1 and started it up. Within 5 minutes black flakes were flowing across the sight glass.
Originally posted by dickwells: Mobil 1 will definitely clean out a sludged engine but it takes a while to do it.
quote:What kind of valve adjustment would a 305 GM engine require? It had hydraulic lifters didn't it?
Originally posted by dickwells: Mobil 1 will definitely clean out a sludged engine but it takes a while to do it. I bought a GM 305 truck at 67K and it had about 3/8" or more of sludge on top of the heads. At 97K I had the covers off to adjust the valves and the sludge showed a heavily eroded "bad lands" pattern as much of it had been removed. At about 125K covers were off again for a valve adjustment and the tops of the heads were clean as a whistle. This with 5K changes with Mobil 1 5W30.
quote:Interesting info George! Although what negative aspects do esters have?
Originally posted by GeorgeCLS: The esters in Mobil 1 are "no more".. One of the evolutionary changes was the elimination of the ester portion of the formulation (needed for additive solubility, natural detergency, seal swell). Thus Mobil 1 is essentially all PAO now, enabled through the magic of chemistry; even superior performance without the negative aspects of the ester. George Morrison, STLE CLS
quote:George, with all due respect...I simply don't believe this. I'm not saying you are purposely spreading a falsehood, but if you have been told this, I think you've been misinformed. And if you got this from the Mobil tech hot line, I'm 99.9% sure you were misinformed. The Mobil 1 web site is not as forthcoming about the formulation of SuperSyn as it was with TriSyn, but it still says that Mobil 1 is made up of "synthetic FLUIDS" (note the plural), "including PAO." So obviously, there are other synthetic compounds to the formulation besides PAO. What would they be if not esters?
Originally posted by GeorgeCLS: I realize my statement (Esers gone!) is a bit of a shocker. But it is true.. Mobil's latest formulation goal was to eliminate ester's from the program. Ester additization has been around since day 2 (day one found the additives at the bottom of the container: additive fallout!) and have been a cornerstone of Group IV PAO synthetic oil formulation. But, if one looks at the current MSDS for Mobil 1, you will note the absence of ester.. It took years of work to achieve a formulation that significantly outperformed the PAO/Ester blend but, Mobil did it.. This is what Sypersyn was all about; the ads about it being revolutionary, new, etc. were true.. Additive solubility, seal swell, detergency were all achieved.. George Morrison, STLE CLS