I have a new 1970 Chevy LT-1 solid lifter 350 that I've had since 1989. Currently has 200 miles on it. Ran Northland Superline 7 15w-40 diesel oil so far. Decided after reading endless posts here and on the C3 Corvette forum, that I need to change soon. So many opinions, it is so hard to make a choice. After reading the Mobil 1 info, that recommended 15w-50 for this engine with a SN rating and proper zinc levels. I decided that is heavier that I would like, so I am leaning toward their 0w-40 Euro spec oil that is SN rated with zinc. Good choice for a very rare low mi. engine? Also has to be a "over the counter oil" that I can get anywhere.
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