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Survey says yes based on the first engine to be released for the Gen 6 engines, the LS6 in the 2027 Corvette. LS6 has DFM. Lifter QC and construction has been improved (better/larger locking pin). Bottom end has dual oiling circuits instead of one like on the gen Vs. The internet (i.e. Facebook) sleuths saw that patent for a rocker arm cylinder deactivation on a pushrod engine and is running wild that all of the Gen 6s will have this when so far...none do. Service manual, parts catalog, etc. on the LS6, its got 16 active lifters and has DFM. -
I toggled my updates off a couple of years back. Since I don't have any CEL activity and the truck runs fine I'm happy to refrain from rolling the dice. I figure they've got it as good as it's gonna get. Recalls are another matter and I will strongly consider those if I get a notice in the mail. -
We'll know soon. But at the end of the day they'll likely not take owner aggravation and costs into consideration. Probably the most important factor to them will be bottom line, along with units sold. Did they make money off sales of AFM/DFM-equipped vehicles? If yes, and the margin was large enough in spite of warranty and recall costs, I don't know that they will consider much else. Aside from government involvement of course, as in EPA and other regulatory bodies.
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By Grumpy Bear · Posted
HM oils and cleaning. Well, soft deposits yes, perhaps. Like you say esters are present in in theory that should be a plus. But, is there enough? 🤔 The marker is the "Aniline Point" and it has to be pretty low to solve out baked on deposits. The softer sludge, yea, they do that and that is the claim. Valvoline R&P is the only HM oil I know of (Jury is out on Mobil 1's product) whose chemistry is uniquely able to remove the hard stuff and not be so aggressive as to swell seals to uselessness. Oxidation levels in virgin oils blends is a good indicator of ester level and higher is generally a lower Aniline number and at one time we could predict without the $400 aniline test it's effectiveness. AN's, alkylated naphthalene doesn't show up in the oxidation test but does show in the aniline test and has become sort of a cheaper go to but most oils only add enough to solve the additive package. Not nearly enough to clean the harder carbon materials. To your second question about does it matter. Yes is the short answer. Deposits are insulative. Those under the piston crown for example add octane requirement for knock free running. We don't' normally notice in todays motors due to Knock sensor driven ignition R-e-t-a-r-d. At least until the full slate of available values is consumed. Newer motors also often use oil jets to cool the piston to achieve tunes that would otherwise not be possible. Deposits on either side subtract from that. Deposits in fine screens used in VVT/VVL or DFM/AFM services live and die on cleanliness and screens are front and center. Vacuum pumps as well like brake booster in the K2's. 90% of todays oils are Group II+/III blends. A few more at PAO/AN/Group II's. A few boutique oils not Walmart shelf materials have enough solvency to prevent but not remove the hard stuff. R & P the current exception. Even HPL's EC30/40 used as directed (20% max) will get the soft stuff and some varnish out but not the hard stuff. That orange varnish isn't baked on oil. Those are fuel varnishes left when the fuel diluted in the oil drops out when the oil cools. Like sugar does in a saturated mix of sugar and water that is put into the frig. That is ring sticking material and a glue the binds hard carbon sometimes. Name brand shelf oils are intended to provide a useful service life at the least cost and highest benefit to the OEM who is trying very hard to keep you in $500 a month payment programs where the real money is made. Did I miss anything you asked or left unsatisfied? -
Yes, I understand. And I was saying (poorly), that it popped up on the DIC when I didn't have that info screen up. Just like you, but for a different maintenance issue. And just like yours mine didn't need to be shown at that time.
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