There's a pretty thorough discussion of coolants at westfalia.org, if you
should find yourself troubled by insomnia some night.

Don't ask what engine oil is best around here or you may start a Dreaded Oil
Thread. Many like Mobil 1 15-50. Use a Mann filter and fill it to around 1/2
the way between the marks on the dipstick.

Congratulation on your new purchase--sounds like a nice one.

By the way--have your mechanic check and/or replace the fuel lines, esp. in
the engine compartment. It's not a high cost item and is well worth it for
the peace of mind.