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Bluedevil coolant stop leak reviews11/16/2023 ![]() Attention to the promotional reviews shows promise that BD is more effective than Lucas or Barr's tranny sealers. So I finally decided to try the Blue Devil - carefully. Maybe after a few days, a visible drop of Dexron redness would appear on the pan. Wiping it clean with a paper towel will prove it.Īt this point, I'd notice a puddle every couple weeks - enough to soak half a paper shop-towel. Of course, the drop-pan makes a leak look bigger than it is. We did that, and the leak was very much reduced.Įven so, I saw that noticeable ambient temperature changes with the weather would evidence a more obvious leak. ![]() I finally consulted the shop manual, which noted that leaks at the main-seal can sometimes be solved or reduced by re-torqueing the transmission attachment (to engine) bolts to factory spec. My leak attenuated only slightly, and I since drained and replaced all the Dexron in the tranny. The Valvoline is considered by mechanics as "just a Dexron-III alternative" for older transmissions some opinions suggest you can just keep adding it to the regular Dexron-III, although Valvoline discourages that sort of usage. I bought some Valvoline "Transmission Stop Leak" for the top-up. ![]() I scrubbed the concrete garage floor and got rid of the mess, but the dark stain is still there. The automatic tranny at first was leaking enough to require a one-quart top-up over less than a year's time, to the 9-quart capacity spec. Of FREAKIN' COURSE it has leaks - the odometer shows 188,500 miles right now! Anyway, I bought drop pans after fretting about the leaks. However, I've been watching my leaks more closely latelyĪfter replacing the rear window and rebuilding my suspension (ball-joints and shocks) back in October 2018, I became anal-retentive - Obsessive-compulsive about raising the maintenance-level of my old 95 Trooper. But I'd had luck with the Blue Devil Rear Main Sealer product for engine-oil leaks of that sort.Īnd by the way - I would not panic over small leaks from an old vehicle. I consider that advice as a recommendation not to totally dismiss. Good mechanics will tell you - some of them, anyway - that they "don't recommend chemical additives" for leaks - whether for the engine, the cooling system and radiator, or the transmission. I bought this 16oz bottle of Blue Devil Transmission Sealer about six months ago - hadn't broken the seal on it until three weeks ago.
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