Joew2604
Veteran Member
Changing oil and filter on Universal diesel in Catalina 35. I have an unused gallon of O'Reillys 5-30 oil. Do you think it would be OK to use this or should I buy the Rotella T 10-40? Thanks for your thoughts.
He dosn’t need luck now that he’s got the word.
“Salad”?
I wouldn’t have thought the penalty was quite that bad.
Short answer - NO !
You must use ONLY a diesel rated engine oil in a diesel Engine or major engine internal damage will occur.
No exceptions. Unless you want to turn your diesel engine in to engine salad.
I don't know anything about the " gallon of O'Reillys 5-30 oil " oil & what it's specifications are, but it sounds like it is car gas engine oil.
That is a No-No to use gas engine oil in any Marine Diesel engine.
How about instead using some good old "Chevron Dello Diesel Engine oil" - Available almost every where & Diesel rated & not expensive. Even have it at Sam's club. I use either straight 30 weight or 40 weight in my Diesel.
Please, read the engine owners manual for the correct weight & Viscosity diesel engine oil that you are to use in your diesel. 5-30 oil is for good gas mileage in gas engine & not usually used in old technology design marine Diesel engines.
use the correct oil & you will be happy you did.
Good luck.
Alfa Mike
Save the O'Reilly's oil foro your lawn mower. Get the owners manual out and see what the recommended oil weight and spec are for your engine. Once you find out that then you can select the brand that best meets your needs.
Wifey B: Hope not Romaine.
O’Reilly’s oil may be re-branded Castrol like Valvoline re-labeled as NAPA oil.
But diesel engines need oil formulated for diesels.