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Maintenance & Repair Synthetic motor oil
8536 messages, Last post on Nov 21, 2009 at 9:34 AM
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Take a look at this commercial website for some basic sludging info, and remember that it is a commercial site with something to "sell". |
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Replying to: ralph1970 (Aug 08, 2009 1:41 am) Actually, the same has been true for me. Since that time, I have owned 5 Toyota Landcruisers. All have run a min of 15,000 miles OCI's. One was sold with app 250,000 miles on it. Another was sold to a MB diesel mechanic because he wanted it. I did state upfront I ran 15,000 miles OCI's and he looked at me with an attitude like... so what? My more recent ones run 20,000 miles OCI's and one is at 170,000 miles. (Garage king/queen). But the key here: those engines (I6's) have never been "sludge a matics"..... which really was the original point. So anyone who buys products mentioned in the class action cases is in effect forewarned. I frankly do not know of the Toyota policy that says in effect, don't worry, we will fix the sludge problem with no hassles...
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Replying to: ruking1 (Aug 08, 2009 9:41 am) 
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Replying to: wtd44 (Aug 08, 2009 11:40 am)
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Replying to: ruking1 (Aug 08, 2009 1:47 pm)
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Replying to: wtd44 (Aug 09, 2009 7:36 pm) I suggest just reading CR at the local public library or the magazine stand. Also, there are databases (EBSCOhost) which I can use via my library to read most periodicals in a timely manner and CR is available after 3 months in PDF format online! While many people like and trust their ratings, I read them with a grain of salt looking for their inconsistencies in statements showing a preference between vehicles and other things where it's only their opinion.
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Replying to: imidazol97 (Aug 10, 2009 4:38 am)
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Replying to: jeffyscott (Aug 10, 2009 8:29 am) Great!.  Thanks for correcting my time line. I'll take advantage of that.  Now if the local library can just upgrade their AllData subscription to include home terminals!!! instead of having to use it in the library... 
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I just got the oil analysis back from my annual oil change. Everything was within the normal range and the oil was still good for use after over 13k of driving the past year. (With higher gas prices the past year, we have cut way back on our driving). The oil didn't need to be changed, but I do change the oil and filter once a year. It costs me about $90 a year to use synthetic oil, and with gas at about $2 a gallon, I save about $65 a year with better gas mileage using synthetic oil. I also know that there is less wear in the engine because all the wear metals in the oil are very low. I have been using Amsoil and doing annual oil changes for over 30 years now and it has worked for me.
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Replying to: ralph1970 (Aug 13, 2009 7:28 am)  You are one of the few tha have used the oil analysis and have actually started to go so called extended OCI's. So now you just really have to become more at comfort with reading and interpreting what all those figures mean. A quick and dirty (read- but you didn't post the actual data) is your synthetic oil is really at the sweet spot (  13,000 miles) and 15,000 to 20,000 miles are almost a slam dunk. In fact, wear is HIGHLY aggressive when oil is new (0 to 3,000 miles). So oxymoronically when folks do 3,000 mile OCI's, they are effecting the highest and most aggressive wear patterns !! This is even as they are being told this highly aggressive wear patterns are ... good for the engine !! You in effect do not see the new oil SPIKE as over time, it smooths out over time and you are in effect seeing the AVERAGE and cummulative effects the 13k mark. So by pulling the oil "prematurely" you are not giving the oil the time and repetitions it was DESIGNED to dispense what it was truly designed to do, over repetition of miles. Again this is simple to verfiy or debunk. Just draw a sample 3,000 miles or less and send it to Blackstone (or whomever you use) and compare the wear results. So for example, there are three measurements you should evaluate the oil in your case 13,000 miles. 1. totals are important 2. The first is that generic engines AVERAGE per thousand miles 3.your specific analysis, again. per thousand miles. Here is one that I follow: Calculated by dividing total wear metals by miles in thousands. The national average is 6.538 ppm total wear metals, less Mn and Ni. This is based on 51 ppm total / 7800 miles by Blackstone. TDI Club Ave : 6.614 ppm. ~~~~~~ Club Ave. OCI : 9808 mi. 5/19/09 link title Suppose your results are in the "top 10" range of 2.252 to 3.144 ppm. You do not wanted to exceed the "average" and you wanted to let the OCI go as long as possible. So your range is 6.614 ppm / (*9,808 miles) 2.252 ppm to 3.144 ppm per 1,000 miles = 2.94 to 2.104 = 28,835 miles to 20,636 miles OCI. So for example since I am a belt and suspenders kind of guy, I cap it at 25,000 miles. (round numbers)I know full well the oil filter and engine oils are designed for 30,000 miles OCI's !!  At 120,000 miles I have changed the oil (after recommended break ins) the last 4 times. The thing runs like the proverbial top.
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