It could be an ebrake... My bet as of now is the wheel bearing from the Front passenger side tire.. My fathers mechanic put some new wheel bearings in and who the heck knows what he put in, probably some cheepo's. Cause last summer durring the summer if i had been driving for a long distance (10-15 miles) it would make the same sound, only alot fainter and after i let it rest for a while, it would be fine agian. This never happened before it was taken to him... But after driving her today to work (feeling bad since she has sat alot this summer) the noise would come and go i'd say with maybe a 30-40 second interval before the noise came back... when i next find time (probably next week some time), i'll put her on the lift and check her out... That and wash,wax, and detail the interior.... The search continues..... i'll let you guys know what i find, keep suggesting though (just so i have a list of things to go over while im under it)

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1983 Euro 240D 277K
2016 Mazda 6
Coming Soon, 2013 Mercedes E350 Bluetec
Formers:
2012- Mazda 3
2007 Outlander- complete pile
1995 E300 Diesel 208K
2007 VW Passat 2.0T 63K SOLD
2003 Jaguar X-type 3.0 Sport Sold 04/11 w/88K
2009 Lexus RX350 9061 miles. Sold 04/09
2008 Mitsubishi Lancer GTS:Totaled Sept.,09 @ 24,000
2003 Infiniti I35 58K Sold
1984 300 turbo diesel 222K