Quote Originally Posted by youngrider View Post



...CL-4 plus is an official API oil service specification, it was introduced in 2004 as an enhanced CL-4 (introduced in 2002) category). If I can remember it right, the same ASTM tests are used with the following modification/s:

1. The time in which the candidate oil is tested is prolonged.
2. The wear allowed is reduced.
3. The harsh conditions e.g. corrosive potential, in which the candidate oil is subjected are intensified.
4. Soot control requirement is enhanced.

Sir, you mighjt mean CI-4 plus. You can confirm this by visiting the Official American Petroleum Institute(API) Website * www.api.org or visit this link http://www.api.org/certifications/en..._Oil_Guide.pdf

CL-4 is non existent, CJ-4 is the latest rating introduced in the year 2006. In the year 2002, CI-4 was introduced. CI-4 Plus was later introduced as an upgraded designation for an enhanced CI-4. The API service ratings for engine oil is marked in order or series (meaning if it starts with CA, CB would follow, then CC, then CD and so on). After CJ-4, we would expect a new rating to be marked as CK-4 and after CK-4 - thats the time CL-4 would be existent.