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There are reports from Europe indicating Ford's VCT in the 3V V8 (used in the Exploder, Mustang, and F-series) run fine on 5W-30 synthetic.
Ummmm....and what does that have to do with the HEMI?
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There are reports from Europe indicating Ford's VCT in the 3V V8 (used in the Exploder, Mustang, and F-series) run fine on 5W-30 synthetic.
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Blazer, I really have doubts that running a 5W-30 in a MDS Hemi will "break" the hydraulic actuated valve components.
And I base this on my experiences with hydraulic servo valves & pumps on plastic injection presses.
If the MDS system will truly not actuate for oil viscosities over the 8.5 to 9.0 cSt range, then with our cold winter weather, there's alot of Hemi drivers who can't get the MDS to activate due to the 5W-20 in the crankcase being only 195C degrees and 10 cSt.
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Maybe 9.7cst will not pose a problem, but that is a 20 weight isn't it?
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The difference was almost instantly felt. Car started up much faster, MDS kicks in much quicker and with even less warm up and the fuel economy is up 2.5MPG.
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I was in the autoparts store a few weeks ago and a guy pulled up in a brand new 300C. It had the US service manual specifiying 20 weight oil. Problem is finding this product in Australia because I have never seen it. Perhaps the Chrysler dealers order it for their cutomers. Anyway, I got the distinct impression that he was going to use a 40 weight.
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The difference was almost instantly felt. Car started up much faster, MDS kicks in much quicker and with even less warm up and the fuel economy is up 2.5MPG.
OK, so if I understand your comment, the MDS was kicking in with the 30 weight oil and it just took longer for the 30 weight to warm up & thin out.
So it looks like the MDS will operate at thicker than the theoretical 9.3 cSt that divides the SAE20 from the SAE30 viscosity grades.
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So please, don't start to draw unfounded conclusions. It doesn't work.