which one do you guys recomend?

[GAZ-V-21]

I currently am using lucas 10w 40 semi sinthetic oil in my 400 but was wondering if lucas fully sinthetic 20w 40 might be better for it. Where i live in midwest has some very hot humid summers so was just curious if going thicker and fully sinthetic might be a good idea?

[CJM]

Ive never had anissue with rotella 15w-40 conventional, its cheap and works great.

Only syn I use is mobil 15w-50 and I liked it alot but at 7/qt it isnt cheap.

[Thumpin440ex]

Rotella oil here aswell. Switched to that in everything I own. Use to run Castrol

John

[KKiowaTJ]

I live in a humid hot box as well. Never had a problem yet with 10w-40 honda gn4 either in winter or last summer when it was 100+ real feel out.

[Mtndew99]

I just go to Walmart and buy a castrol gtx non synthetic I think it works just fine it's cheap I just change my oil after every race