Latly, i decided to move (for Cat Engines) from a qualty of API CH4 to API CH4 and change the frequency of oil change from 250 hr to 330 hr.
Does somebody know how to define the oil.
There are some internal quality in that oil (15W-40 API CH4)

MISTAKE CORRECTION
i decided to move (for Cat Engines) from a qualty of API CGCG44 to API CH4 and change the

HI DAN:

SEE ATTACHMANT FOR CG-4 V/S CH-4
FOR changing the frequency of oil change from 250 hr to 330 hr you have to do oil analysis test to estabilish the right drain interval

regards

sorry dan i could not send you the attachment
by noria forum you will find it in your e-mail box amidan@netvision.net.il

Thanks.
I checked the oil on 330 hr and the results are good.
In general, in a dusty conditions, i do not like to extend the oil life. The cost/benifit is not olways the cost of the oil/
Dan