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  1. I want to thank everyone on this forum for the many responses I have received in ONE day regarding my car search. Specifically, I am considering a 1985 Seville (serial numbers over 3000) as a daily driver (perhaps a commute once a week) and otherwise a weekend cruiser and garage beauty. My concern is the HT 4100 and the fact that the Carfax indicates less than 200-300 miles on the car per year. It's a low miler - 50K- and has the original engine. I've learned about using 15w oil, or maybe 20w, or some say only 10w - and most seem to think the coolant tabs aren't needed. I didn't see them at my local auto parts store, so maybe it's okay not to need them. I like the Seville style. My concern is not only the proper maintenance for this engine but also the fact it has been driven so lightly over the 31 years that if I begin a commute 90 miles highway round trip one morning the gaskets, as old as they are and everything else, might leak. The radiator and thermostat were replaced on this car in 2014. Makes me wonder if overheating occurred, and that's a concern, too. I'm still considering the car. And I'm checking the huge 77 Eldorado too. But I'm not as excited about it as I am a Seville. ? Thank you for being very helpful to me. I appreciate all of you - and this forum - very much! caddyfan16
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