Oil for 1700 X-flow

[Donnie]

What weight oil is everyone using in their 1700 Kent. The manual calls for 15W40 which is diesel oil. I've run Castrol 10W40 since buying the car 10 months ago and everything seems to be fine. Thanks for any thoughts. Don

[bball7754]

Lots of info on oil, Crossflow specific and general, on Blatchat. I started with 10w40 in my Crossflow, but have been using various 50's for the last few years. I think as long as your pressure is fine, the 10w40 will work.

Steve

[Dave W]

I do not think it is a matter of 10w-40 Vs 15W -40 but the additive in the diesel oil. The EPA had taken Zinc Dithiophosphate out of the regular motor oil. lf your Kent engine has a HI LIFT cam then you need the EP additives. The recommend diesel oil still has these additives. Search ZDDP and get the full story. Anyone with HiPo flat lifter cams should be using diesel oil.
Dave Whitt

[Donnie]

Thanks. Certainly learning a lot about oil. Don