• Abstract and Figures
• Public Full-text

ANALYSIS OF LUE OIL – PART TWO Ground Rules by John Martin and Robert Patton I’ve been reminded that each quarter we have new members that In Issue 54 we started talking about the cause and effect of the may not have access to the previous material. Therefore, before lower 2007 diesel emission requirements. To examine the changes you look at the results of the oil test (or any test or article written for to lube oils we contracted with a “hired gun,” John Martin, formerly your consideration) one has to wonder if there is an agenda hidden (25 years of service) of Lubrizol Corporation. behind the data. Do I have a hidden agenda here? For those not familiar with Lubrizol,it is one of a handful of companies Most assuredly, no. I have several friends in the lube oil manufacturing that make and sell the additive package that goes into the fi nished and retailing business. The TDR has lube oil advertisers. I cheer product, the one gallon lube oil jug. for race teams with lube oil sponsorship and livery emblazoned on the sided of the race car. Lube oil companies sponsor many of the More on John’s credentials: He holds several patents and has diesel drag race and diesel sled pull competitions in which the TDR published many industry-related technical articles. he is a past audience participates. Chairman of the Cleveland Section of the Society of Automotive Engineers (SAE) and both a Recognized Associate and a Silver When new lube oil is analyzed you can get a good idea of the quality Spark Plug (their highest honor) of the Technology and Maintenance of the additive package that, as learned from Martin’s experience, Council of the American Trucking Associations. He is a recognized makes up 20-25% of the lube oil blend. Maintaining viscosity at lubrication consultant to both the racing (NASCAR and NHRA) and higher temperature, maintaining high alkalinity and protecting trucking industries. against wear with the right blend of molybdenum, zinc, phosphorus, and boron are important lube oil attributes. Readings for calcium We were fortunate to have John’s article addressing the CJ-4 lube are a way to measure dispersion detergency. oil specifi cations. Then in Issue 55 John wrote a three page article that debunked several lube oil myths. In a blind-sampling-from-the-bottle test done by Trailer Life magazine in January 2005, I was greatly disappointed to see that Last issue we blindfolded John and sent him oil analysis data from Wal-Mart Super Tech 15W40 diesel oil stood toe-to-toe with other eight unused lube oils and asked him to comment. Astutely he very respected brand names. picked the CJ-4 oil out of the bunch, identifi ed the Exxon/Mobil oil by its unique blend of additives, and used price logic to determine Why disappointment? First, consider what John Martin said in the lube oil from Wal-Mart. He didn’t hold anything back when he Issue 54, “Consequently there is less and less difference between stated, “I wouldn’t cross the street for a free crankcase of oils 3 engine oil that barely passes the API certifi cation test and one that (the Exxon/Mobil Delvac 1300 Super CI-4 plus) and oil 4 (the Shell is designed to pass by a signifi cant margin. Therefore, oils meeting Rotella T that meets the new CJ-4 specifi cation) unless I was running a given performance spec (example API CI-4+) are approaching a fl eet of busses or garbage trucks.” commodity status.” John commented on all eight of the lube oils with his favorites being Second, I am not a big fan of Wal-Mart. I could go into a long tirade oils 1 and 8. Oil 1 was the Cummins Premium Blue CI-4 plus and but I will refrain. oil 8 was Shell Rotella T (synthetic) CI-4 plus. Price dependent, John’s choice was oil 1. Third, for all of my vehicle ownership years (let’s see, that is about 36 years) had I been duped? Had I fallen for the marketing hype? Or At the conclusion of the article we promised that we would add more as we know, the focus on lube oil base stock versus the importance oils to the survey. And we did. From mail-order to tractor dealer, of the additive package changed over the years. Is this a good to truck stop, to European diesel oil, we added 13 more lube oils excuse? I do not want to believe that lube oil is just a commodity. to the test. Yet the Trailer Life grid did not lie. Before I share the results it is necessary to establish the ground Your thoughts? How about this, “Well, Mister Editor, you’ve rules. For those of you that have good recall you can skip this established that the test is unbiased. But, if you are not going to section. change what a person believes, why bother?” Good observation and question. The answer, “I’ll spend the money on lube oils and analysis so that John Martin and I can have data to debate and discuss. If by chance the data might enlighten and educate others, then so be it.” 56 www.turbodieselregister.com TDR 57 TECHNICAL TOPICS . Continued JOHN’S COMMENTS Well, I see my reward for interpreting oil analysis data on eight samples (TDR 56) is 13 more samples to analyze. Is the editor trying to trip me up or have me assassinated by irate oil company executives? Perhaps they will just try to buy me off – we all know Refl ect back to the editor’s statements, they have plenty of money! “for all of vehicle ownership years Before we start, I need to explain something about my interpretation (let’s see that is about 36 years) had I been duped?” of the oil analysis. I can only analyze how I think each oil will perform based on its additive composition because none of these An understanding of the 69-80% of your lube oil’s properties helps analyze base stocks. Having said that, recent API base stock will answer the duped question. performance categories (CI-4, CI-4 plus, and CJ-4) have demanded oil performance levels which can no longer be met by inferior quality base stocks. I would venture to guess there is not one Group I base stock used in any of these oils. Base Stocks But refi ners continued to improve mineral oil base stock quality. Some highly refi ned base stocks met the performance requirements Oops, I realize that I’ve introduced a new term to the audience— of Group III stocks. At the same time, better synthetic base stock base stock. You know, we’ve beaten the Performance Package to formulations were developed. This necessitated the formation of death and it’s 15-20% of your lube oil’s contents will be thoroughly Group IV and V base stocks in order to distinguish between the analyzed as you look at the data. So, is the choice of lube oil as performances of very good synthetic base stocks. Keep in mind simple as a price per gallon/Performance Package comparison? that as base stock performance improves, the cost of the stock (and How about the balance of your lube oil, the base stock? the oil) increase accordingly. Refl ect back to the editor’s statements, “for all of vehicle ownership Today I would avoid any oil which utilized Group I (and preferably years (let’s see that is about 36 years) had I been duped?” An Group II) base stocks. Today’s engines need better oils than that! understanding of the 69-80% of your lube oil’s base stock will answer Group III and Group IV base stocks give the kind of performance the duped question. (Group III mineral oil and Group IV synthetic) you need in your truck. Group V stocks aren’t really needed here unless you have Let me attempt to explain base stock in terms someone other than money to burn. chemical engineer might understand. Lube oil base stocks were traditionally compounds of a certain boiling temperature range which The only real base stock issue today is whether you want to utilize are recovered when crude oils were boiled in a huge distillation mineral oils, synthetics, or partial synthetics in your vehicle. I prefer column. Heavier distillation compounds include material such as mineral oils, because they cost so much less than synthetics. road tar, and lighter compounds include such materials as diesel Synthetics are only needed under extremely high or low temperature fuel and gasoline. The composition of lube oil stocks coming off a conditions or when you are after maximum horsepower or fuel distillation column were a function of the crude oil taken out of the economy. Partial synthetic oils make a good compromise in ground. Oil company types used terms such as “sweet” and “sour” terms of both cost and performance. I use partial synthetics in crude oils to describe different crude oil composition (and different my motorcycles because air-cooled engines are subject to greater crude oil performance). In that era base stock quality made a temperature variations than water-cooled engines. signifi cant difference to lube oil performance. Pennsylvania crudes were particularly good performers. Finally, don’t fall for the statement that synthetics can be cost- justifi ed because they can be used for twice the normal oil change Over time refi ners learned they could develop refi ning techniques interval. This is simply no longer true.

Load more

  6

Copy Link