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Not sure about the 10W-40 for the Esprit engine...

My 88-92 and 93-V8 manuals call for 20W-50 or 15W-50 depending on temperature for the Esprit 4cyl 910 engine....

I have used Mobil 1 15W-50 for years. Will change to 20W-50 for the track next summer. The tappet noise was louder with 20W-50 in the winter, so I switched to the 15W-50, and it sounded better.
 

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My manifold is fine. I often drive it through the winter since we get a lot of nice days, and they don't use salt here.

I also drive in the rain, even a few times in pretty deep water, 4-6".

It tends to overboost in temps below 30 or 20F, so you have to either reset the ECU for colder temps, or take it easy on the boost.
 
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