Originally Posted By: Syntheticuser
Should I get a uoa done this oil change on the Zetec Focus? It will have 290k miles on it then. It has Castrol Edge EP 5w30 and a Microgreen oil filter. This is the second fill of Castrol EP.
Great choice of oil & filter!! To me, a UOA is only good to find out if you had contamination in the past, such as coolant or silicon (air filter). On that combo, I'd go up to 1 year or 10k miles, whichever comes first.
And of course you can check to be sure the air filter path is tight, avoiding dust incursion thru cracks, by inspection anyway.
A UOA mostly tells you about stuff you can't do much about, like iron wear, interesting but what do you do about it?
You're already using some of the best oil and filter available, so a UOA really boils down to detecting coolant leaks. Check to see if your coolant level drops too fast to determine if you're missing some anyway.