Engine oil, change at least once a year, I change mine in the fall, in case
you have not read my recent debacle over oil changes causing engine
damage... I grease more often than called for as far as the power steering
fluid, and hydralic oils. The crackle test is a good method it will detect down
to 500 ppm water.
Frybrid Vegetable Oil Fuel Systems -- Crackle Test for Water Contamination
BTW, 1000 ppm or less water is ideal, you will always have some water
present due to atmospheric water. Unless you live in AZ.
Another good test to run on hydraulic oils etc. and you can get test kits
to run at home is the TAN or Total acid number. You can often call your
oil manufacturer and they will tell you what the typical TAN is for new oil
and what the upper limit should be for in use fluid.
You can also send samples out for testing, sample analysis will often only
cost $10-12 for basic analysis v. $100 for changing the hydraulic oil in my
TC40DA. The first time you send samples out send out a sample of virgin
oil also for a base line.
Engine produce acid exhaust in burning of fossil fuels, engine oils contain
overbased calcium sulfonates and calcium phenates to compensate for the
acid produced however every time you run you engine some of those acids
remain in the air in the crankcase. If you tractor sits for extended periods
the atmospheric moisture and these acids can combine and create corrosion
in your engine typically above the level of the oil on parts that have no or
extremely thin oil layer on it. running you engine every few months so it is
up to temp will significantly aid in preventing any condensation
corrosion.
Gear oils, hydralic oils, power steering fluid, etc. typically do not have the
same issues as they do not have to deal with the amount of soot or acid
engine oil do. However, circulation of these systems will only aid in protection
of their systems and the longevity of the equipment.
BTW, regular oil analysis can show that oils can be running much longer than
the hours recommend for change. When I first got my F-350 (7.3L Powerstroke)
I ran oil analysis on the engine oil, after 25,000 it was still good but the soot
levels were just getting a little on the high side then. I do not put alot of miles
on it any more so once a year it gets changed, did my oil change already for
this year, BTW, I run Delvac 1 in it. As soon as they release the 30 weight
version I will be running that in the New Holland. BTW, unless your engine has
a high oil capacity, typically it is not economical to run oil analysis. My
Powerstroke is 4 gallons of oil, my tractor is 6 liters; 6 liters is not worth testing.
4 gallons was worth testing for a baseline with typically use at that time. Now
it just gets changed once a year. The wife is a stay at home mom now, vs she
worked an it was a daily drive back then and I have a company car now. Ten
gallons of hydraulic fluid is worth testing.
Mobil 1, Delvac 1 and the Amsoil oil are the only products I know for sure
run Group IV basestocks most other "Synthetics" run Group III, and in my
opinion are not true synthetics, but that is another (long) story. I do not
know what the story is with the new Castrol Edge product, yet.