I run Castrol 20-50 in the summer and 10-40 in the winter in my Spider. Since you're a new owner, I'll throw in another recommendation:
Use a Baldwin main oil filter (vice the FRAM cardboard junk). They're available through Centerline or IAP. Also, every other oil change or min once a year, change the small SPICA fuel injection pump filter as well. THIS IS VERY IMPORTANT. Many uninformed Alfa owners do not change that filter. That Injection Pump is a delicate and very fine piece of machine work, and expensive to repair or replace. Protect it and change the filter regularly. I'll bet the one in your car is goopy and filthy.
Since your engine is old, I would NOT change to synthetics. Synthetics can magnify even very tiny oil leaks. If you do a rebuild and replace all the seals, then a switch to synthetics would be ok.
Welcome to Alfa ownership. They're great cars and easily maintained/repaired by an owner who's willing to learn. And the more you learn, the more you'll want to know.
Use a Baldwin main oil filter (vice the FRAM cardboard junk). They're available through Centerline or IAP. Also, every other oil change or min once a year, change the small SPICA fuel injection pump filter as well. THIS IS VERY IMPORTANT. Many uninformed Alfa owners do not change that filter. That Injection Pump is a delicate and very fine piece of machine work, and expensive to repair or replace. Protect it and change the filter regularly. I'll bet the one in your car is goopy and filthy.
Since your engine is old, I would NOT change to synthetics. Synthetics can magnify even very tiny oil leaks. If you do a rebuild and replace all the seals, then a switch to synthetics would be ok.
Welcome to Alfa ownership. They're great cars and easily maintained/repaired by an owner who's willing to learn. And the more you learn, the more you'll want to know.