I have been using either ½ or 1 qt of Gunk Engine flush for more than 25 years and had no problems with seals at all, so I have no reason to try another brand.
Pros: no problems with seals
Vehicle:
Volkswagen Golf
Reviews of GUNK parts For Business
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5.0
Manufacturer Ranking
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1
Spare Parts
1
Country
USA
Spare Parts