| Start-up oil burn; should I go heavier visc? |
Subject: Start-up oil burn; should I go heavier visc? by Schrade on 2015/5/26 23:39:23 Q: If I go heavier viscosity, will I get less oil burn-off @ start-up? '90 LT-5 was assembled withOUT valve stem seals. The oil burn @ start-up, even after ONLY overnight sitting seems common, EVEN IN LOWER-MILE CARS - 30-50k. Mine has 37K. I didn't notice it in mine when I got it. But soon after first oil change (I went 5W-30 Syn, when most recommend HEAVIER weight), I noticed it. Now, with headers + 3" OPEN pipes all the way back, I see a little more... --------------------------------------- There's a 'confederate' factor here to consider, about where it's coming from: LT-5 pulls LOTS of oil through the PCV, into the plenum. I saw this FIRSTHAND. After I did top end rebuild, I did 2 0r 3 Closed Loop idles in garage. THen I pulled the TB, and saw a small pool of NEW OIL @ the PCV-to-PLENUM inlet. Posted a snappic on Z boards. Everyone said NORMAL!!! They also said put in a catch can. So, ... thoughts? If I go heavier weight, will I get less oil through the valve stems, after overnight sitting? And, might I get less oil pulled through PCV??? |
