Re: 1941 Packard 110 - Fluid Change Intervals

Posted by Ross On 2016/9/29 6:53:55

In the old days gear oils would thicken greatly with use which is why they said to change them in the fall so that they weren't like margarine by the time February rolled around. Occasionally I will get in something that has been inactive since the seventies or so and the gear lubes will come out like tar.
The modern oils don't do that and seem to hold their viscosity pretty much indefinitely. At this point I am doing something on the order of 40,000 miles or ten years on my cars. These gearboxes and axles are all broken in and not shedding metal unless they are already on the edge of failure.