Unfortunately, I have what appears to be a rear main seal leak on my '83 R100RS. I have oil dripping off the rear edge the oil pan. I replaced the oil pan gasket hoping that was the culprit, but no luck. So, I am considering Bar's Leaks Rear Main Seal Repair engine oil additive. The can says, "Most leaks stop within 100 miles or 2 days of driving. One bottle (32 oz) treats 4 to 6 quarts of oil." I am due for an oil change. I thought I could drain out 16 oz of oil and put that amount of Bar's Leak. Either way, I would only leave it in for a short period and then replace the oil. So, what is the opinion, super cure or snakeoil??