butters
Active member
I think its too manly for you anyway
Mobil delvac 0w40 full synthetic, it's cheap at napa and flows to about -40ish. I run it year round with no issues in my cummins. On a HEUI engine, the faster you get oil flowing and pressure, the easier it'll start. Below -10 15w40 is turning into tar. I'd rather have cold oil pressure lubricating the internals than a warm block with molasses for oil that takes 30seconds plus to start flowing.