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rear main seal leak
hi. i have a '88 3.2. the engine was rebuilt about 12,000 miles ago. on one of my oil change i used synthetic Mobil 1 and the rear main started to leak. i did an other oil change with a non-synthetic oil and the oil leak stopped. now i have the engine out and i want to replace the rear main but i've seen that there is 4 supersesions. on my rebuild i put part # 999.113.426.41 and it seems that is the newest one out. the seal is made by Kaco and it's black. my original one was light brown and made by Kaco as well. any ideas what would be the best one to put in for running with synthetic oil. thanks
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