Patchuli oil scares away most pests but rats are a voracious bunch. I assume a heavy chemical stench would keep them away. Lay down some petri dishes filled with friction modifier and differential lubricant. Most mammals are intelligent enough to avoid such things.
I would say toulene or gas but that would evaporate in short order.
Even better, place the car on jackstands so the little buggers can't reach it!
Oooor....just place food somewhere else so they go for that instead of the ride. Toss some scraps in a small container in the general vicinity. They will be more interested in the food than a large metal object.
There is a possum in my neighborhood that likes to climb up and sit on top of the engine (I assume it's a bit warmer up there) after he eats the dogfood. He's our unofficial 3rd pet. =)
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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