As I do lack deeper understanding of both ASTM D5293 and ASTM D4684 I'd highly appreciate
some help.
Apparently ASTM D5293 is for CCS viscosity while ASTM D4684 is for MRV/low temp. pumping
viscosity. I came across a seemingly odd observation while comparing the datasheets of both
Ravenol REP 5W-30 and VMP 5W-30. To me they don't correlate the way I had expected. When
both are similar base oil composition (which is just an assumption), similar kinetic viscosity and
exact same pourpoint, shouldn't the oil with the lower CSS also exhibit the lower MRV? If it isn't
the case, should I conclude base oil compositions aren't the same? Different amount of VII?
Ravenol REP 5W-30:
https://www.ravenol.de/en/product/m...avenol-rep-racing-extra-performance-sae-5w-30
Ravenol VMP 5W-30:
https://www.ravenol.de/en/product/motorenoel/pkw-motorenoel/ravenol-vmp-sae-5w-30
That said, Ravenol RUP 5W-40 acts as expected from a thicker version of REP (higher PP and KV40) .....
https://www.ravenol.de/en/product/m...avenol-rup-racing-ultra-performance-sae-5w-40
..... while it's still lower CCS viscosity compared to VMP 5W-30 though.
Hope I made my little dilemma sufficiently clear. Again I'd highly appreciate administrable answers.
Thanks in advance!
for reference:
https://www.astm.org/d5293-20.html
https://www.astm.org/d4684-20a.html
some help.
Apparently ASTM D5293 is for CCS viscosity while ASTM D4684 is for MRV/low temp. pumping
viscosity. I came across a seemingly odd observation while comparing the datasheets of both
Ravenol REP 5W-30 and VMP 5W-30. To me they don't correlate the way I had expected. When
both are similar base oil composition (which is just an assumption), similar kinetic viscosity and
exact same pourpoint, shouldn't the oil with the lower CSS also exhibit the lower MRV? If it isn't
the case, should I conclude base oil compositions aren't the same? Different amount of VII?

Ravenol REP 5W-30:
CCS Viscosity at -30 °C | 4301 | mPa*s | ASTM D5293 |
Low Temp. Pumping viscosity (MRV) at -35 °C | 14.870 | mPa*s | ASTM D4684 |
https://www.ravenol.de/en/product/m...avenol-rep-racing-extra-performance-sae-5w-30
Ravenol VMP 5W-30:
CCS Viscosity at -30 °C | 4740 | mPa*s | ASTM D5293 |
Low Temp. Pumping viscosity (MRV) at -35 °C | 12.000 | mPa*s | ASTM D4684 |
https://www.ravenol.de/en/product/motorenoel/pkw-motorenoel/ravenol-vmp-sae-5w-30
That said, Ravenol RUP 5W-40 acts as expected from a thicker version of REP (higher PP and KV40) .....
CCS Viscosity at -30 °C | 4510 | mPa*s | ASTM D5293 |
Low Temp. Pumping viscosity (MRV) at -35 °C | 21.300 | mPa*s | ASTM D4684 |
https://www.ravenol.de/en/product/m...avenol-rup-racing-ultra-performance-sae-5w-40
..... while it's still lower CCS viscosity compared to VMP 5W-30 though.
Hope I made my little dilemma sufficiently clear. Again I'd highly appreciate administrable answers.
Thanks in advance!

for reference:
https://www.astm.org/d5293-20.html
https://www.astm.org/d4684-20a.html