Checked mine with an endoscope looks like the E D on the inside is very poor or non existent we have a similar problem at work it takes a lot of experimentation to get it right air pockets inside the tube. As Herman says load it up with waxoyl or similar. Luckily mine seems to be in remarkably good condition and i shall be taking steps to ensure it stays that way! Don't be lazy check yours and sort it before it's to late. The later car's might be better protected, manufacturing techniques could have improved but I wouldn't risk it. I know this doesn't help those already afflicted but it could stop it happening to youOriginally Posted by Herman
Would assume rust from the inside due to lack of protection
Drill a 6mm hole in the lower center, use the holes at the top to put in any type of rust inhibitor if you have the holes (if not drill again)
Fill until it drips out of the newly drilled hole...............done.................
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