Just make sure it the crusties are filtered out, it is dewatered either by time or by heat/circulating air, and it is not very cold down there! I prefer to convert it to Biodiesel myself as our IP's don't like too high a percentage of the thick stuff for very long. If you keep the percentage low, you might be OK. Check out the Biodiesel Infopop forum for the SVO users. They can give much more advice.
Mark Chapman DP member #653;
1983 K2500 6.2 Suburban, 4" lift, 35" tires, ATS turbo, Banks exhaust/intake, pyrometer, tachometer;
1986 K5 6.2 Blazer, 2" lift, 33" tires, Banks intake, pyrometer, tachometer
1963 wife, one owner, average mileage for the age but in excellent shape, a keeper
1992 daughter, low mileage, pretty, limited edition, but requires some money to maintain
1995 son, sports model, very fast & peppy, time will tell on durability and maintenance costs
"Grease is good"