Posted by IndianaRed on December 23, 2008 at 16:11:18 from (68.31.110.77):
I've always thought oil pressure should be higher in lower temperatures.
Yesterday morning when I started my 4.8 Chevy at 0 degrees it started right up, but boy it wasn't happy, click, click, click. Probabaly a lifter? It had done that once or twice before, but just for a second or two. This time it did it for quite a few minutes. Scary sound. Then all day yesterday and today I noticed my oil pressure was running low. Checked oil level, fine. I run Lucas in it all the time and figured that should help with cold starts, but maybe it was just too cold for anything to help? But I'm thinking the Lucas makes it a little thicker/heavier. Someone told me these 4.8's do that a lot, but I wonder.
So today I changed the oil, mostly to see if there were any shavings in the oil. It looked good, and instead putting 5w30 back in, I went down to 5w20. Drove it around some and the pressure was back up to where it should be.
So thicker, cold oil won't come up to pressure as well? Seems backwards to me.
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