Posted by CenTexFarmall on May 08, 2008 at 11:09:16 from (172.167.176.147):
In Reply to: Which oil to use? posted by Another Bob on May 08, 2008 at 10:10:28:
Just like medicine, oil is technology driven.
Most modern oils have greatly reduced levels of ZDDP, due to catalytic converter issues and because modern engines have roller cams and rockers and stuff. The ZDDP is good for preventing metal to metal contact in boundary lubrication situations such as flat tappet cams and shaft/ball socket rocker arms.
The modern oils that do have sufficient levels of ZDDP are diesel type oils, typically a 15w-40 and racing type oils.
You can buy additives to boost ZDDP levels buts it's easier and probably cheaper to just pour in diesel type oil. Chevron Delo 400, Shell Rotella T or Delvac 1300 will fit the bill in a 15w-40, giving multi-grade protection and high quality base stock.
If you read and understand the labeling, they're intended for mixed fleet use which means gasoline and diesel.
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