Engine Oil

[Larry Lowenkron]

I have been using Aeroshell 15-50 year 'round, and have decided to switch to 100 during the summer. I was wondering what people are using in their Franklins. Do you use the W100 Plus or just the W100? I know the Plus has the additive required by the Lyc AD for E series engines, but wonder if there is any advantage to using it in our engines. Any insights, comments or...? would be appreciated.
Thanks! Larry

 

[glennhake]

I've heard that Multi weight Aero Shell is just fine if you fly weekly (from Cessna engine forums on O470 and big bore Continentals). However if you might go 2-3 weeks between flights single viscosity oils seem to cling better and chances of internal corrosion will be less. This is because the natural viscosity of a multi weight oil is at the low number. Engine heat causes it to thicken. I stuck with correct single viscosity oils on my last engine and it went 300 hours past TBO and 30 years. It could have easily gone longer if I had more guts. It will be interesting to hear other responses.

 

[kgassert]

Greg Lucas told me several times not to use multiweight in the Franklins and that 100 plus is the thing to use.

Kevin