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The ATF has additives in it to rejuvenate/"swell" old seals. I used to put half a quart of ATF in my Jetta every oil change and I drive that car a lot harder than my 240. I never had any problems. In fact, it helped out my smoking problem. The ATF swelled the valve guide seals and therefore less smoking.
I think they use a similar additive package to the high-milege oils like Castol or Quaker State.
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