- Joined
- Oct 2, 2001
- RO Number
- 2657
- Messages
- 621
The simplest reference from Crusader can be found under the FAQs on this page http://www.crusaderengines.com/classic/#owners, but I saw another reference in the past that was even more explicit. It said "Crusader Marine now recommends 15w40 in all its engines". I couldn't easily find it again. You will drive yourself crazy asking about what oil to use. All new oil is much better than the old stuff. If you are a seasonal boater and changing it ever season after maybe 100 hrs of use, you likely won't have any issues or concern. It's the flat tappets that need a bit more care, and even that you will find debate about. I probably read a hundred pages on the internet and then used that knowledge to form my own opinion. I deciding higher levels of ZDDP certainly aren't bad for the motor, so why take a chance on the newer environment friendly stuff that has much reduced levels (which gains them certain gas engine certifications). So far so good. Seeing Crusader recommend it, I was good with it. I also use it in my Kohler generator. One 5 gallon pail does all 3 motors with about a gallon to spare.