Most of the differences in building engines for off road SCORE or desert endurance racing purposes, say experts, concern the endurance factor. The annual Baja 1000 is actually 1,300 miles of punishing off-road racing. The winner will take 25 or 26 hours to complete the race, so the engines have to last for that long.
If you leave leftovers or any food out too long, it will speed spoilage. Two hours is generally the max they should be left out, though the sooner you refrigerate them the better (remember to factor in the time it takes to drive back from the grocery store, and the time it takes you to unpack your groceries).
The way fats and oils go bad is through oxidation. It will go rancid, and trust me, you will have no problem telling when that happens. Two to three month old lard that was kept refrigerated should be fine. In the future, divide it into smaller portions, wrap it in airtight plastic and freeze it.Works for butter and bacon, as well. friend and I want to make carnitas this weekend. I have some lard in my garage fridge that I bought maybe 2-3 months ago from a Mexican market. It s the kind that stays solid at room temp. It doesn t appear to have gone bad but I don t know how well this stuff keeps.