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This will sound like a silly question but what makes the V10 a heavy duty modular engine? I've ready things on this forum like "cross bolted mains". I'm not sure what that means but it sounds heavy duty.
All modular motors, the 4.6L, and 5.4L and the 6.8L V10 have cross-bolted mains.
The V10 has SIX bolts on each main cap, two cross bolts (from the side of the block), and FOUR holding the cap down. I'm pretty sure the 4.6L have only two cross bolts, and TWO holding the cap down. I believe the 5.4L is the same as the 4.6L.
The V10 has a forged steel crankshaft.
Everything else, I believe is the same as the rest of the modulars.
Given 4.6L's and 5.4L's go 200K miles, and the V10 definitely goes that and further, personally I consider the entire modular engine line "heavy-duty".
But the V10 does have certain features that make it slightly heavier duty, as I said above.
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Also, the under-hood sticker on my Superduty says "This engine conforms to ULEV emissions for Heavy-Duty Truck engines".
Which means, emissions-wise, it conforms to heavy-duty truck engine specs - which are more lax than passenger-car emissions specs.
So, there's two ways of looking at it.
It's called a "heavy-duty truck engine" for emissions purposes.
AND, it does have "heavy-duty" features in the block and crankshaft.
I talked to him bout it today when he picked it up. Uses regular PENNZOIL of all things with pennzoil filters, at 6000 mile intervals. Said it has been the best truck he ever had......basicially i am speechless. So mine using MC oil and filters at 4000 intervals should last me forever.............