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ZDDP is being phased out of all motor oil you can buy on the shelf because it is potentially harmful to catalytic converters. ZDDP is coming out of all API-rated (American Petroleum Institute) oil. In the near future Shell Rotella T will no longer give extra protection previously expected from...

I would say that had an individual been using a lower detergent oil for a long period of time and going to long on intervals , then switching to a series 3 type diesel package with its much higher levels of Metallo organic compounds (detergent additives) a cleaning of the engine could take place...

I buy a 275 gallon tote of oil every 3 months, so sitting not a problem. Virgin vis of 16.1. Other samples on different machines with this batch fine at 14.5 to 15 . but this tractor came back low last 2 samples.

John Deere tractor 4320, diesel engine, 200 hours. I do not know how to post a UOA.

On a recent sample I ran on a 15w40 conoco my Vis dropped to 10.10 with no antifreeze contamination and fuel within limits at 0.50, What could cause this drop?

It is my understanding that amsoil is a great product but that in situations of storage a mineral oil will provide better cling to metal surfaces. I may be wrong but in those older cars a straight vis. mineral oil may provide better protection than a multi grade filled with VI Improver. But...

I ask because I have had 2 different oil companys call on me. 1 was schaeffers which by googleing them brought me to this site. They claimed that they use a 100% pure paraffin with some syn. and that the mineral oil in other oils is not of the same quality. Judging by your post they must be...

What does 100% pure paraffin base mean? are not all oils of paraffin base?