pneumatic hacksaw died

[structures]

I can't seem to keep a pneumatic hack saw. I first bought a cheapy from harbor freight used it for a couple of weeks and then it slowly just stopped working one day. Sat it to the side and picked up a IR 429 saw. Used it for a couple of weeks then it did the same thing. Slowly stopped cutting.

I have a water filter before the tool and it is down line of the compressor. There is plenty of iron pipe between the compressor and filter.

What is strange is that I noticed on the day each tool died I used a couple of drops of Kobalt air tool oil. Then almost immediately... maybe a couple of minutes of total cutting time the saw just slows down and eventually dies. I have tons of air tools and I always use this oil on other tools with out problems.

Is there anything else? Are pneumatic saws more fragile than most air tools? Do you think the oil may be the cause? Please let me know what you think.