Ray,

When you first use Camguard it will knock a lot of stuff off the inside of the engine that will affect your oil analysis if you are doing that. If you are flying your plane regularly then it is not needed.

FYI

Roscoe

More then you’ll ever want to know about aviation oil and additives can be found in this YouTube video -> https://www.youtube.com/watch?v=ibX8xJYxsSA It’s a fantastic webinar from Mike Busch done for EAA. He typically gets twice the TBO between engine overhauls (for a variety of reasons) so if you ask me, his webinars on how to take care of an engine are well worth anyone’s time. I think I’ve watched every one of his from leaning, advanced leaning, electronic instrumentation, EGT/CHT temps, “Big Data” computing of EI data (VERY interesting), oil analysis, and more.

To save you the time from listening to the entire 2hr webinar (about an 1.5 hrs of PowerPoint, and and .5 hrs of questions,) *generally* he prefers the combo of Aeroshell W100/W80 and Camguard, changed every 50hrs or 4 months (if using regular oil filters.) He also recommends sending your oil off for analysis each time to develop a history that can be one of the tools to help catch internal issues before they bite you.