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Could someone please explain how GL-5 rated oil affects gear surfaces? I have a disagreement with someone who insists that it will cause pitting in spur or helical gears in lightly loaded applications. I believe this person is mixed up and must be thinking about possible effects on yellow...

I've gotten ahold of an old 5 ft. drag shredder that will get occasional use. It was cheap. It's also worn out! I've cleaned out the goo and rust from the inside of gear box. The gears are worn, lots of back lash. Also a lot of the teeth are badly pitted from rust. The plan is to put some...

Finally got to tear into a motor I've raced on the dirt track. I've run Delo 400 15W-40 almost exclusively. Motor is a 402 BBC. Steel crank, 7/16 rods, Federal Mogul tri-metal type bearings, KB hypereutectic pistons with around 8.5:1 compression, Crane flat tappet hydraulic cam, oval port heads...

I'm working on a '53 Farmall Super M. The trans and rear share oil in the case. I would like to use 80w-90 or 85w-140 GL-5 due to ease of availability and cost. Some (not at BITOG) have suggested that the EP additives in the GL-5 might cause pitting in low unit loaded spur gears such as would be...

What do yall think about spiking Delo 400LE, the new formulation, with some STP to boost the zddp level back up? I would think half a bottle of the blue would be enough with a five quart oil change.

I've looked and looked on the forums for this and haven't found it. I thought somebody else might have asked so if it's already been posted somewhere just point me to the thread. Thanks

Does anyone know if it would do any harm to run a GL-5 type oil in the rear of an older tractor? Searched and couldn't find anything on the topic. I figure if the additive pack is good enough for a hypoid gear set then it should work for spur gears and such.