cookiejar Posted October 20, 2015 Report Share Posted October 20, 2015 Our family has 3 vehicles with Northstar 4.6L engines build on the same line as Cadillac DTSs. We love their magnetic rides. Two are 2006s and one is a 2007. They have from 100,000 miles to 140,000 miles on them. We had a bad scare this summer when all three engines suddenly had their bottom halves dripping oil. Oh no, not oil pan seals! But how could all three possibly do it at once? I got underneath and with the engine idling used an air gun to clear the oil away from the joints and see where it came back. I started at the oil filter, lucky me. That's where the oil leak was. It had been the first time we used white NAPA oil filters and had tightened them the full turn as labelled on the filter. When we replaced them with Frams, we noticed the gasket was a lot stiffer and took a lot more torque for its full turn. No more oil leaks on all 3 cars. I would hate to think of people getting $4,000 gasket jobs because of lousy oil filters. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted October 20, 2015 Report Share Posted October 20, 2015 I would stay with AC/Delco oil filters. Others here will say why. Another sneaky source of oil leaks is the oil pressure switch that screws into the oil filter adapter. It can get dinged by a wrench or road debris and leak when the engine is running but not drip in the garage. A surprising amount of oil can come through a dinged oil pressure switch. If the oil pan is wet but your garage floor is dry, it could be the oil pressure switch. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Promodmerc Posted November 16, 2015 Report Share Posted November 16, 2015 I passed out when I read the original poster used FRAM filters. The only thing FRAM is good at is marketing. I will only use OEM or WIX on my vehicles. Link to comment Share on other sites More sharing options...
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