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Why swap another engine with 25 year old seals that probably will leak, unless of course you plan to reseal it first.
Good seals will keep any oil in. My strategy was to just pick off the jobs one by one as time permitted, but the best and easiest way to do it, especially if you have another car to drive, is to just pull the motor and do them all. Several of them go from 5 hour jobs to 20 minute jobs that way. But, yeah...conventional oil does not keep the insides of engines very clean, especially if it isn't changed regularly. Wash all that varnish away and you've got nothing but shrunken dried up gaskets and seals to keep the oil in. I have seen the difference in cleanliness side by side tearing down motors and I will continue to use at least part synthetic even if it means resealing.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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