mkskeet50
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I have a 1952 m135, it's a slow going project. What oil weight is good for the engine?
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It's covered in the TM's in the links provided above . Have you downloded them ?So the ups truck got stuck in my driveway, the m135 winched the box truck out without a problem. What type of gear oil do you guys use for the pto winch?
See critical edit made above. Basically, steel-on-steel rubbing (shear) must be below a particular maximum PSI in oils without enough ZDDP or similar EP friction modifiers. Newer engines use roller lifters/followers/tappets partially to get more aggressive valve timing, but also to remove the shear component of camshaft lubrication. Old-enough truck engines might be OK without much/any ZDDP (it wasn't a common lube oil additive until the 1960s), but it's Russian roulette for your engine, and there is no downside to using an oil formulated for engines with flat tappets and high valve spring pressures. 'Truck' oil works well for a lot of older engines - I have 1960s Chevies that are now on a regular diet of it as well.I like Diesel rated 15/40 in just about everything for summer and then 10/30 for winter. Please do a net search on ZDDP and its lack in modern oils now. Lack of this additive can cause catastrophic damage to older motors that don't have roller cams. Eddy