Conversation Between Daryl Hunter and azdiezel

Hi Daryl, Just finished reading the old thread on synthetic oil and saw that you have a 03 6.0 and are pulling a trailer, which is what i will be doing now that i have a similiar ride...will let the v10 excursion have a well deserved rest. Which brings me to the same question, I just bought my truck and am not sure what is in it...it has 150k miles and still not sure what to put in. I have used castrol syn/blend in the v10 changing every 3k and seems to work ok, i just don't have any experience with the diesel...yet. any response would be appreciated, thanks, rex