Have you ever used a motor oil additive? Which one(s)

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Only once and that was back in late 70's probably about 77 or 79, I had a big 1975 Gran Torino 351W and it developed a rear seal leak ,dumped in a bottle of STP oil leak stop to slow down the leak buy a few weeks until I could afford to get the seal replaced. The stop leak slowed the leak down a great deal and I drove it around for about 6 weeks and then had the rear seal replaced. The STP stopleak was a band aid nothing more,but in my case it did what it was suppose to do, Certainly not a long term fix.If something leaks the leak needs to be properly repaired Period!, But a leak stop can certainly buy some time until proper repair can be made.
 
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