shell or delo?
- Thread starter Toy4x4runner
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I'd be interested in seeing a copy of the independent test data that you speak of oilman86. What conditions were the tests conducted under? I'm wondering because the Delo 400 in the EGR trucks at work has held up extremely well. With the Delo we have been able to maintain our 15,000 miles OCI.
Toy4x4runner, I’m not sure what the shear specs are on the Delo, however it does hold up well in all of HEUI engines which are very hard on the oil from a shearing standpoint.
Toy4x4runner, I’m not sure what the shear specs are on the Delo, however it does hold up well in all of HEUI engines which are very hard on the oil from a shearing standpoint.
Delo may in fact be marginally better oil than Rotella-T, and I've used it many times, but Rotella-T hasn't hurt my old 6.9L much. If I could find Delo easily around here, I'd probably use it. When I find Delo, it's always substantially more money than Rotella-T and I don't think the difference in quality is as substantial as the differnce in price. When I got my Ford 19 years ago (my first diesel- still have it), I wondered which oil to use. When on a trip across country (CO to FL) towing a 30 foot travel trailer I took note of something. Back in those days, you had to use truck stops more to find diesel fuel. I started looking in the trash cans to see what oil the truckers were using. At that time, Rotella-T was everpresent and that became my oil of choice. Scientific, huh?
Gentlemen, Here is info sent to me by the late Stinky Peterson of Butler Labs (RIP, respected friend). He emphasized that the numbers are not statistically significant due to too many confounding factors. He also said he never was able to determine one brand superior to another. Butler specializes in heavy equipment, truck, tractors, etc..
Take for what it's worth. It probably crossed more than one formulation change.
From Mark:
"Here is some more data. I did this without considering blends, only brands and viscosity. I also included a column for high viscosity since that is usually more of a concern in diesel engines than viscosity loss since it limit to OCI. Feel free to post this data.
FYI - I searched for samples without fuel. Experience has shown the many samples with fuel will test negative so no doubt this data contains some samples with fuel dilution that tested negative."
Mark
# Samples Low High % Low % High
Penzoil 355 8 0 2% 0%
Farmland 971 43 10 4% 1%
Mobil 23096 1049 1839 5% 8%
Exxon 17988 863 565 5% 3%
Shell 24679 1209 939 5% 4%
Citgo 10228 629 422 6% 4%
Cenex 9937 623 183 6% 2%
Valvoline 62 5 3 8% 5%
Duron 774 67 15 9% 2%
Schaeffer 360 35 0 10% 0%
Deere 1870 191 11 10% 1%
Farmoyl 175 19 0 11% 0%
Amsoil 92 10 6 11% 7%
Texaco 6464 726 41 11% 1%
Conoco 13918 1608 392 12% 3%
Chevron 31252 3660 701 12% 2%
Cat 16240 1942 941 12% 6%
Phillips 859 162 5 19% 1%
Kendal 374 97 6 26% 2%
Take for what it's worth. It probably crossed more than one formulation change.
From Mark:
"Here is some more data. I did this without considering blends, only brands and viscosity. I also included a column for high viscosity since that is usually more of a concern in diesel engines than viscosity loss since it limit to OCI. Feel free to post this data.
FYI - I searched for samples without fuel. Experience has shown the many samples with fuel will test negative so no doubt this data contains some samples with fuel dilution that tested negative."
Mark
# Samples Low High % Low % High
Penzoil 355 8 0 2% 0%
Farmland 971 43 10 4% 1%
Mobil 23096 1049 1839 5% 8%
Exxon 17988 863 565 5% 3%
Shell 24679 1209 939 5% 4%
Citgo 10228 629 422 6% 4%
Cenex 9937 623 183 6% 2%
Valvoline 62 5 3 8% 5%
Duron 774 67 15 9% 2%
Schaeffer 360 35 0 10% 0%
Deere 1870 191 11 10% 1%
Farmoyl 175 19 0 11% 0%
Amsoil 92 10 6 11% 7%
Texaco 6464 726 41 11% 1%
Conoco 13918 1608 392 12% 3%
Chevron 31252 3660 701 12% 2%
Cat 16240 1942 941 12% 6%
Phillips 859 162 5 19% 1%
Kendal 374 97 6 26% 2%
Very interesting data. Guess I'm kind of suprised that Mobil had 8% of their samples come back with high vis. That leads me to believe that they are not very good at disbursing soot. Also very suprised at Chevron low vis samples hitting 10%. Looks like 10% of all Delo users are probably using a 30w or less... I'm also suprised that the Cat oil isn't closer to Mobils numbers since they are one in the same.
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