Originally Posted By: gpshumway
Originally Posted By: asharris7
Originally Posted By: CATERHAM
The low KV100 of 7.9cSt doesn't necessarily mean this is a light oil as the HTHSV must still be at least 2.6cP to be labelled a 20wt oil. In fact the low KV100 can simply mean that not a lot of VIIs are used which tend to artificially boost the KV100 spec'.
By comparison the QS syn blend 5W-20 has a KV100 of only 8.0cSt and not surprisingly has a lowish 149 VI; HTHSV is 2.6cP.
The lightest oil on the market is the Toyota Brand 0W-20 and it has a KV100 of 8.8cSt due undoubtedly to it's high VII level.
The Idemitsu made Honda 0W-20 has a KV100 of 8.5cSt but it's actually about 10% heavier at 100C and 25% heavier at 20C than the Nippon Oil made Toyota 0W-20. (That's from first hand experience as I've run and track tested both those oils.)
Member BruceT has also had a VOA done on the COP oil (hasn't posted it) and IIRC the VI is about 172, similar to M1 and Valvoline.
If you want to go with a high VI, high moly oil, the two main choices States side are the Toyota Brand 0W-20 and the Idemitsu made Subaru OW-20.
Oh and gpshumway, thanks for posting this.
Don't forget the Mazda oil..
This is an old thread. The high-moly Mazda oil wasn't available when Caterham posted.
I know, I was just saying...