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Thread: Engine oil weight. 20w50 vs "dry" start up wear???

  1. #1
    Join Date
    Apr 2004
    Posts
    517

    Default Engine oil weight. 20w50 vs "dry" start up wear???

    Engine oil weight. 20w50 vs "dry" start up wear??? Advice to run lighter weights to minimize start up wear seems contrary to need to use lower weights in very cold conditions because of "drag" of heavier weight oil in the engine.

    PO for 173k '89 5255s was running something that burned a quart per 750 miles. Switched to Shell 20/50 and got 29.4 mpg with 1/4 quart per 1000 mi in trips that included Raleigh, NC to Wilmington and Raleigh to eastern W Va - Harpers Ferry.

  2. #2
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    i run 20w50 castrol in both of mine, i like the heavyer oil in the sohc motors because it keeps the valve train quiet in our hellish summer heat, twin cam motors like thin oil for their hydraulic lifters
    all america wants is cold beer warm cat and a place to take a poop with a door on it

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