I used a service for the oil in my 1992 Caterpillar 3406 for years. It was the last year of mechanical injectors and they were famous for an internal seal to leak fuel into the oil and thin it, along with head gaskets and liner o-rings leaking coolant over time. Invaluable information to detect impending issues and take corrective action.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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