I am being offered 10 quarts of used Royal Purple synthetic to run as fuel. Has anyone ran that stuff before? I have not knowingly messed with synthetic oil yet.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

i dont think i would want to run that stuff as fuel. Its a racing oil designed not to burn, in fact I've sold it to people trying to pass the Boise emission laws because it wont burn. Run it through a few oil filters before you dump it in, if you decide to, there is bound to be metal in it.

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800

Love the environment, eh? You could mix some in with fuel or bioD, but up here, we only run shop heaters on used motor oil. Zinc, boron, etc, all sorts of crap that ought not be in a compression process.

I declined the offer. If it were just regular synthetic or a blend, I would try it. Royal Purple is high-end synthetic and I just don't feel comfortable dumping it in.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

I'd run one gallon oil to full tank fuel.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran