I am aware of all of those, plus the gt500 of all years, the Boss 302, and gen1 track pack. All 5w50. However I still have seen nothing from Ford stating the gen3 5.0 should use anything but 5w20 on the street and 5w30 track-only.
So you implying I don't know what I'm talking about ? That's fine. Colour me stupid then, and carry on.
I haven’t implied anything.
If that's the case, then there would also be an accompanying TSB instructing all dealers to make the change going forward. I'd like to see that document, until then it's just hearsay or just one random dealership saying so to charge 3x as much for every 18+ GT oil change (w20 is $4/qt w50 is $12/qt).
I’d wager any Engine Dyno operator worth their salt that has their crankshaft style dynamometer outfitted with load cells, vibration sensors could hone in on the critical speed demons during a few warm up sweeps.
they can't obviously because otherwise Ford would be on the hook for millions in EPA 'effeciency' fines after having to restate MPG figures. VW diesel-gate part deux. Ford passes those fines onto consumers at time of purchase if you look at the window sticker.
For lateral criticals, you are correct. However, I bet that the unsupported lengths are short enough such that the laterals are very high. I'd be more concerned about the torsional criticals, which are orders of magnitude more difficult to measure.
Ford specified 5W50 for all performance variants of the Mustang since about 2007, not just the GT350. It has nothing to do with the "tolerances", or clearances for that matter. They didn't do anything wrong. It's more like they weighed the intended severity of use of the vehicle vs the affect it has on the CAFE rating and determined it was worth it to specify the 5W50 in those cases.
right, because the units shiped is so miniscule they don't register in fleet metrics. But since too many GT are sold they fudged the oil recommendation to not have to slap every GT with a $1000 cost-to-buy fine which might impact units sold.
Yes, that would be a smart way to start, but you would need numerous multi-event wheels positioned along the crankshaft and cams as well. If your crank reluctor happened to be at a node, then it wouldn't show any oscillation at all even if there were significant issues. Keep in mind that all 4 cams would play into the harmonics, their own rotational inertias, along with all 4 cam chains acting as springs. I get a headache just thinking about the complexity of the analysis.
I agree with all of this! I would love to know what a Ford tribologist would put in his own personal Mustang GT. Like I said, I think 5w30 or 5w40 is a good compromise, which is why I use 5w40 in my own. If you look at the non-CAFE world such as marine (outboard, inboard, PWC), ATV, UTV, snowmobile, diesel, etc, the vast majority use Xw40 as well.
