I am seeing "Petro Jelly" used.
One Example:
http://www.bigr.com/home-basics-personal-care-body-care/vaseline-petro-jelly-7-5-oz.htm
I put PetroJelly.com at $500 to $1000 Retail
Previous sales of "Petro" and "Jelly" domains:
petronic.com 550 USD 2016-12-22
GoDaddy
petroware.com 109 USD 2016-09-10 NameJet
petrowest.com 321 USD 2016-09-07 NameJet
petromet.com 224 USD 2016-08-10 DropCatch
petromiles.com 2,000 USD 2016-03-21 Uniregistry
petroserv.com 664 USD 2015-05-28 DropCatch
petrotank.com 827 USD 2015-05-19 DropCatch
petroc.com 2,230 USD 2015-02-08 Uniregistry
petrogal.com 101 USD 2014-10-20 NameJet
petrogal.com 110 USD 2013-10-20 NameJet
peanutandjelly.com 1,500 USD 2015-07-31 Uniregistry
strawberryjelly.com 273 USD 2015-02-01
GoDaddy
cannajelly.com 210 USD 2014-03-13
GoDaddy
strawberryjelly.com 815 USD 2013-02-01
GoDaddy
screenjelly.com 1,285 USD 2012-07-02
GoDaddy
Petroleum Gel is better but longer. I put this one at $600 to $1200 Retail
Here are a few similar sales of "Petroleum" and "Gel":
orgel.com 577 USD 2016-06-01 SnapNames
norgel.com 104 USD 2016-12-14 DropCatch
coolgel.com 3,000 USD 2016-05-12 Uniregistry
nexgel.com 175 USD 2016-02-04
GoDaddy
petroleummaterials.com 1,040 USD 2013-09-16 Afternic
petroleumtrading.com 1,188 USD 2013-09-02 Afternic
petroleumservice.com 2,088 USD 2012-10-31 Afternic
petroleumindex.com 420 USD 2012-07-31 NameJet
petroleummanagement.com 750 USD 2011-01-07 Sedo
petroleumeconomics.com 2,000 USD 2010-02-10 Afternic
petroleumsolutions.com 2,000 USD 2007-10-02 Afternic
petroleumonline.com 2,488 USD 2006-11-14 Private