Importance of Front Undertray
#21
03-20-2016, 05:41 PM
Since this post originated as an X100 undertray and now we're discussing the X350 cars 
I'll go ahead and continue the X350 route. The undertray is there for aerodynamics (which probably helps a little with gas mileage), the pillows (plastic covered foam) might help with sound deadening but, are really there to absorb a coolant or oil leak until the foam is essentially full and then it leaks onto the ground. It's really there to absorb the fluids that leak so that it can help Jaguar save money from warranty costs. Realistically, say there's a small leak from the oil filter adapter that your not aware of on the front of the 4.2 engine at 48K miles.... Then by 52K miles (which is now out of warranty) the leak got much worse and is just starting to leak on the garage floor that you just noticed. Do you think the dealer is going to goodwill that 2K mile out of warranty oil leak?? More than likely not a chance.
I'll go ahead and continue the X350 route. The undertray is there for aerodynamics (which probably helps a little with gas mileage), the pillows (plastic covered foam) might help with sound deadening but, are really there to absorb a coolant or oil leak until the foam is essentially full and then it leaks onto the ground. It's really there to absorb the fluids that leak so that it can help Jaguar save money from warranty costs. Realistically, say there's a small leak from the oil filter adapter that your not aware of on the front of the 4.2 engine at 48K miles.... Then by 52K miles (which is now out of warranty) the leak got much worse and is just starting to leak on the garage floor that you just noticed. Do you think the dealer is going to goodwill that 2K mile out of warranty oil leak?? More than likely not a chance.After driving the car with it off I'm having a hard time seeing how it helps aerodynamics. I had suspected that the rear of the cover was fluttering at highway speeds causing a mild vibration. Sure enough the car is now smooth as glass at any speed. After looking under the LS there are still some covers going around the engine, but not under the engine itself. I may modify the cover to do away with the under engine section and the rear piece that flutters, but still cover the gearbox and power steering lines for added protection.
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