i think i see zinc is almost 1200ppm...

I see that the phosphorus (antiwear component of ZDDP) level was only 825 ppm in your sample of Delo 15W-40 and that it had the low end of viscosity (12.6 cSt @ 100°C). The viscosity range for 40-grade oils is 12.5 to <16.3 cSt.

Who is the newby here? I guess you're referring to me? Why so critical and picky for crying out loud. If so I joined six years ago. I was asking about VR1 since it was mentioned in thread and thread had died. Thought it was ok and didn't start a new one because so often there are multiple threads covering related information. No, they don't charge for new threads, but man there are a lot of redundant threads. Sorry if I offended....again. I more laid back than the average member here, so it appears.

That was what was in it when I bought it. It has been switched back to Rotella T4 15/40.

The last analysis report for T4 I saw on Bob is the Oilguy showed similar Zinc levels and Phos around 900-1000 ppm IIRC. I don't recall the viscosity but there were no negative comments on it so I assume it is acceptable.

Kevin

HAMB member Blues4U states that he is a lubrication engineer and his posts confirm that he is quite knowledgeable about engine oils.

One of the points he makes is that modern HDEO is very suitable for flat-tappet gasoline engines and that these oils do not require ZDDP supplements. This is in agreement with GM TechLink's Engine Oil Myths.

The Delo and Rotella appear to be excellent flat-tappet engine lubricants even with the much lower phosphorus concentrations than the 1400+ ppm that many people believe are crucial. I also think that it is not beneficial to use an oil that is thicker than necessary. See Engine Wear.

Good info.

me and my sons use it primarily in older engines the viscosity is good and so is the price im currently running it in my 500 strocker with no problems

This is the answer I got from Shell, when I asked about the new formulation. I use it in my older muscle car engines, and recommend it to my customers engines.

Hi Jim,

Our CK-4 formulation still has about 1200 ppm of zinc and 1100 ppm of phosphorus, and should still be able to provide adequate protection for flat tappet engines. I’ve attached a brochure that goes over the chemical changes in detail.

I hope this helps.

Best regards,

Aly
Shell Technical Information
1-800-237-8645 (Option 3, 1)

Safety and technical data sheets for active Shell products can be found at www.epc.shell.com.