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I just found this, Castro GTX Classic SAE 20W50, will this work (see photo)? Do you know how many quarts it takes (400CDI)?

Wow, great information. I appreciate the great insight and quick response. You gave me great direction to start on. Thx again!

I am looking to change my oil in my 72 Newport Royal (400 CID). It’s hasn’t been changed in 3 years and only driven about 100 miles during that time. 1st question, do I need to change it, it looks good on the dip stick? 2nd question, if I need to change it, can I use 10w-30, I was told that I...