I have a sample kit here from
BLACKSTONE and the cost is $20 for the basic test + $1.52 postage. There is no charge for the sample kit.
If you were planning on severe service or extended drain intervals then it would be wise to test but for just home use, it would be informative but costly.
That said, it can also shead light on the quality of the oil and filters you are using. I am aware of some people who used a certain brand or oil and filters for years and then had their oil tested and found out the oil they were using was not giving them the protection they assumed all along.
Some are of the belief that any oil and filters are good enough as long as you change it often, the more the better in thier opinion (not referring to anyone here). While on the other hand I take the position of using the best oil and filters I can find. For me its been synthetic oils since 1977 (yes 1977) and al my equipment, the oil and filters are changed annually, no matter the mileage or hours.
Mike
2002 Fireird Trans Am WS6
2001 GMC SLT Ext Cab Z71
2001 Honda Rancher 4X4 ATV
1993 Lumina Sedan
Honda and Craftsman lawn mowers
Husqavarna weed wacker and chain saw
all run on synthetic lubricants from day 1 of use.