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    Oil Viscosity vs Bearing Clearance

    This is another interesting article on oil viscosity and bearing clearance. https://blog.k1technologies.com/bearing-clearance-and-oil-viscosity-explained There are several interesting take-aways: 1) The typical rule that most engine builders follow is that bearing clearance establishes the...
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    I think I Just Ran Walmart Out Of Mobil 1 ESP 0W-30 Oil !!!

    So, on Aug 25, 2021, I ordered 6 Quarts of Mobil 1 ESP 0W-30 oil from Walmart. At $6.86/qt it was the cheapest I could find. The next day, they sent me tracking information on the order. I was surprised to see it split into 3 parcels. 2 quarts were coming from Ft. Worth, TX. 3 quarts were coming...
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    Here's Something You Really Need

    Stumbled across this beauty on the Internet. It is an oil funnel that attaches directly to the oil fill port in place of the cap. It seals so the oil doesn't get on the engine. After it's on, you have both hands free to add oil to the engine. It comes in several versions, depending on the...
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    All You Guys That Think OEM Recommended 16 or 20 Weight...

    oil is too thin and want to move up to a 30 or 40 weight oil for "better protection" might want to consider this: "Contributing factors that can cause oil pressure and lubrication problems in an engine include: 5. Bearing clearances too tight for the oil viscosity being used. Late model...
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    I No Longer Trust Blackstone Labs

    I sent Blackstone a virgin sample of Audi 0W-30 fully synthetic oil. It was clearly labeled as Virgin 0W-30 oil. As you can see from the report below, they thought it was a 10W-30, but also stated it could be a thick 5W-30 or a thin 0W-40. I wonder what that tech had been smoking. I have no...
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    What is the best VW 504/507 oil?

    There are a number of VW 504/507 oils available to VW/Audi owners. All of them claim to be the best. Is there any way to get some comparison of these oils? Thinking about this for a while resulted in me remembering the Lubrizol Relative Performance Tool. Using that tool I looked at eight common...
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    What's wrong with my Audi A4?

    I have a 2020 Audi A4 quattro, 2.0L, TFSI. I change my own oil. Last change was at 10,000 miles with OEM 0W-30 VW 504/507 oil. Current mileage is 19,000. The engine doesn't come with a dipstick, but I found a VW dipstick that would show a full OC about 3mm above the full mark. Here's the...
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    Are There Any "Fully Synthetic" Engine Oils...

    that don't contain Group III oil? Every "fully synthetic" SDS I've looked at contains a significant amount of what I presume to be Group III oil. For instance, the SDS for Mobil 1 ESP 0W30 has as its main component "DISTILLATES, HEAVY, C18-50 - BRANCHED, CYCLIC AND LINEAR." My presumption, and I...
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    Liqui-Moly Class III??

    I have seen it said on BITOG that Liqui-Moly synthetic oils are Class III. This is the oil I plan to use for my next OCI. It is made in Germany and labeled "fully synthetic." I was under the impression that oils labeled as "fully synthetic" in Germany had to be Class IV or Class V oils. Has this...
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    Audi OEM vs Fram Titanium Cartridge Filter

    After seeing Ascent Filtration's study of oil filters (https://bobistheoilguy.com/forums/threads/would-you-all-like-to-see-iso-4548-12-oil-filter-lab-testing-comparison-efficiency-capacity-pressure-vs-flow-bubble-point-and-burst.334882/) I thought I'd see if there was a visible difference...
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    Avoid 30 wt Euro Oils in US?

    I recently purchased a 2017 Audi A4 Quattro. The Owner's Manual said I can use any oil that meets the VW 502 00 or VW 504 00 specification. Looking at <a href="http://www.oilspecifications.org/oiltool/oiltool.php" target="_blank">http://www.oilspecifications.org/oiltool/oiltool.php</a> I saw...
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    Disappointing Oil Analysis Results (Particle Count

    Either the Fram XG Extended Guard 3614 and NAPA Platinum 41348 filters are extraordinary oil filters, or Polaris Laboratories screwed up the particle count analysis on three samples. Here's the basic information: - Sample 1: Toyota 0W-20 after 9837 miles. ISO Cleanliness 17/16/14, with 698...
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    Of What Use Is An "Upper Cylinder Lubricant"?

    MMO and other products are marketed as upper cylinder lubricants. Why would the upper cylinder need lubricating? The valve stems and piston rings are oiled by the engine lube system. Adding oil to the fuel, even a thin oil, would increase the deposits on the spark plugs, valves, valve seats...
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    What About Eneos 0W-20?

    I this a true full synthetic (Grp IV/ Grp V only)? Here are some of the characteristics: HTHS - 2.61 VI - 179 CCS Vis - 5400 (-35C) Pour Point - -42.5C TBN - 7.95 API SN/ GF-5 Oh, and because of their "organic molybdenum friction reducers" they claim a coefficient of friction that is...
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    How to Get Quick Delivery of Samples

    As others have noted, there can be an extended delay when mailing VOA/UOA in the laboratory provided mailing containers. Despite the fact that I've mailed First Class with a Delivery Receipt, I've experienced delivery times of 10-14 days. Recently, I've started mailing my oil samples in small...
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    Low Temp Viscosity of Used Oil

    There was a recent post about loss of low temperature pumpability as an oil ages in use <a href="http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2387492&page=1" target="_blank">(here)</a> . One of the presentations was a powerpoint from Infineum that showed problems...
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    Is it possible.....

    that Pennzoil Platinum 0W20 and Quaker State Ultimate Durability 0W20 are the same oil? Here is a comparison of their data sheets: <div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre> Test PP QSUD Grade...
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    [Cut Open] Bosch D+ and PureONE

    The Bosch D+ and PureONE oil filters are excellent oil filters. However, there has been some disagreement as to whether these are the same filters in different packages or different filters. To try and answer these questions, I cut open a new Bosch D3330 and a new P1 PL10241, the filters...
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    Oil Filter Shelf Life

    I'm thinking on stocking up on Bosch D+ oil filters. If I do, it will take me three to four years to use them up. So, the question is: What is the shelf life of an unused oil filter?
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    20 Wt vs 30 Wt Iron Wear Levels from BITOG UOAs

    I've posted an analysis of iron wear levels from 245 samples taken from UOAs reported by BITOG members. it can be viewed in the <a href="http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2349276&#Post2349276" target="_blank">Technical and White Papers Forum</a>. The...
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