Engine cover fasteners
#16
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IIRC - wasn't Lexus the first brand to start the "another hood" as you called it? My brother bought one of the first LS400's when they hit the market and I'm trying to remember if his was the first one I saw with all the covers. Seems since then most brands have started adding some sort of engine bay cover, even if it's just the manifold.
The reason I think we see it on luxury vehicles is that it maybe creates 1-2 db of noise reduction (I have trained audiophile ears and I noticed no change in sound level at all), and snobbery dictates that their vehicles should not be composed of anything that could possibly get oily or greasy, so it's best to hide that stuff.
Also, from an automakers point of view it probably increases perceived reliability by a small amount, by keeping untrained hands from messing with stuff they shouldn't be touching. I've always assumed that's the reason they switched to sealed automatics as well. Motor oil and scraps of paper towel do not play well inside a transmission.
#17
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In my 2008 the engine covers are held in place with flange nuts, size M6-1.0. I think they _don't_ rattle off, but the shop techs can't be bothered to put them back in place. It's still better than my experience at US dealerships, where the vehicle was returned without engine covers, and the shop asserted the covers were missing as it rolled in. In any case, buy a batch on Amazon - that way they cost .10 to .20,, not the $1 at Home Depot or the $2 at the dealership.
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