The chart below shows Recommended Sampling Intervals for RV engines, transmissions and generators. If you’re still in my area, just give me call and I’ll come and pull your samples when they’re due. Otherwise, if you’re not in my area, you find your nearest NRVIA certified inspector at https://nrvia.org/locate/. Then, just keep copies of your test reports in your maintenance file. We’ll maintain the records electronically in our lab database.

SAMPLING RECOMMENDATIONS
Component	Sample Type	Recommendation
ENGINE	Oil	Every scheduled oil change
	Coolant	Annually (at start of travel season)
TRANSMISSION	Oil (fluid)	Annually (at start of travel season)
GENERATOR	Oil	Every scheduled oil change
	Coolant	Annually (at start of travel season)