Keeping your MAF clean, is a real concern, especially on high mileage cars. There are rattle can sprays made just for this.I had major issues with oil treated air filters in the past, they will eventually destroy your MAF.
On my last Audi replaced a couple of MAF's ($$$$) before realizing what was causing the problem.
There are better ways to create more horsepower, performance filters are ok but look for oil free dry ones.
http://www.crcindustries.com/products/mass-air-flow-sensor-cleaner-11-wt-oz-05110.htmlPlease elaborate or direct me to info..
I have a BMC, and will certainly end up with a lot of miles and possibly buy the car at lease end.