0w40 oil too thin for a tuned 1.8k?

[fergus]

What oil are people using in their K series R500s, etc? 0-40, 10-40 or 15-50? Or something else.....?

what's recommended?

[fergus]

Dave Andrews suggested a 5-40 will be fine, as the hot viscosity will be OK at 40W, but 0W may be slightly thin.

thanks for the replies chaps. Halfrauds may get a visit. If I can find some suitable oil in Costco with the relevant API or SAE code (SL, SM, etc) then I'll bang some of that in (means 500 mile oil changes don't become so prohibitive).

[fergus]

bikemonster said:

I know that Dave Andrews is revered as being godlike among Caterham circles, and with good reason, whereas I am some anonymous forum guy, but a 0w40 and a 5w40 have exactly the same viscosity at high temperature.

At cold temperatures (i.e., startup), a 0w40 is slightly thinner.

Thanks. Aware of the heat ranges. Dave built my engine, that's why I asked him!