Oil change

[Leirhiht]

Hey guys, I'm going to change my oil on my 2008 moomba 5.7 assault engine. I've been using the shell rotella 15w40 but then I started thinking about if I should use synthetic or conventional, and what are the differences in T4,T5, and T6 rotella Oil?

Thanks

[VA LSV]

T4 is conventional, T5 is synthetic blend and T6 is full synthetic. I've been using Rotella T6 for several years. All meet the specs for the 5.7.

[Leirhiht]

T4 is conventional, T5 is synthetic blend and T6 is full synthetic. I've been using Rotella T6 for several years. All meet the specs for the 5.7.

I've been using t4 since I got the boat 250 hours or so ago. What're the added benefits of switching to a blend or full? I'm still going to change it every 50 hours regardless of full or blended oil.

[VA LSV]

Changing oil on a regular basis is by far the most important thing for maintaining engine life. There are benefits to synthetic over conventional but I switched to full synthetic to extend my oil changes to 1 per season because my season would normally end at 60 to 70 hours. T6 is very popular with motorcycle guys. I use it in my Sea Doo and it's always available at my local Wal-Mart.