[77newell]

Thanks guys: I've been using test strips for more than a decade between the 77 and 93 coaches. Only problem I experienced was Detroit Diesel selling me a bad batch. I don't know how old the coolant is in the 93 nor its type so I'm considering changing it. I may go extended life coolant, perhaps with a filter (with valves as Gordon suggested-great idea)

My engine is 8V92TA, love the sound but envy the fuel mileage of the S60.