I am on the 16th year with my 1985 31' Tiara. Just 1520 hours on original 454's.
Just my opinion....when I read the posts about what is the best oil to use straight 30 or 40, multi 15-40 or synthetic, the only boater's that can really voice a valid opinion are those that have owned the boat for many, many years and have not blown an engine. How else can someone running a boat for 2 or three years validate using a specific oil or brand and claim one is better than another?
Signed -
- SAE 30 Heavy Duty Diesel oil- WIX or Napa (optional Longer oil filter).......and lucky.