I probably don't put more than 1500 miles a year on my 69, but I change the oil and lube the car every four months (if it needs it or not). I figure it is cheap insurance, especially if I have driven through water or dusty roads. Low mileage cars tend to contaminate the oil more with water contamination, because the are often not driven long enough to dirve off the contaminants. I also don't trust chasis lubricants over time because I have seen the oil separate in the cartridges, and I assume that happens in the suspension fittings also.
Wallace