WARNING: LONG!
I agree with JohnB: "Quality oils are good in either form. "
Sasquatch was right when he said: "Nobody is going to pay anything for a twenty year old truck with 600,000 miles on it. " Sasquatch made a number of other points I agreed with too. But when he quoted "There's a sucker born every minute", then I have to flip over and slightly mis-quote MGM: "Why defend it more? Maybe it is because we are ATTACKED... every day!"
Nobody ever pays me anything for my used vehicles anyway, because I USE THEM UP. I actually sold one car TWICE, each time for $1. I sold it with a condition, when you get tired of it, you have to sell it back to me for $1. After the first sale, a few months later the friend collected enough cash to buy a new car and sold it back. Later, along comes a second friend, needing cheap transportation for a teenage son, and bingo, sold it again for less than the value of the gas in the gas tank. (Synthetic in engine, still running strong at 390,000, but that's not my main point. )
So at this point, you're thinking I'm crazy/stupid/a sucker for using syn, since even I admit I'll get tired of the vehicle or other stuff will break long before I hit the 1,000,000 mark, and because I could probably do 500,000 on any good petro, and maybe still hit 1,000,000 on something extra good like the LE formulation.
I still say it is not that simple. Cost? I can make the numbers say whatever I want them to say (and believe me, I have run the numbers both ways). Extend the changes to 5k on any petro, or longer for LE, and petro is cheaper. Extend the changes way out on synthetic, the gap closes, maybe even nods in favor of syn. Add in frequent oil analysis, cost of syn goes up again. But if we really want to get down to cost and telling each other how we should spend our money, then I'll bet I could make a pretty good case that more than 50% of the people on this board can't "justify" the Cummins. The recent post on "how many miles" had very few answers in the 150,000+ category. Many don't even tow anything, have no need for this amount of power, and/or could go faster in a much less expensive vehicle.
Let's talk convienience. If I changed every 3k, for me that would be about every third weekend. Nope, not for me. Maybe when I retire and have more time. 6k? That's still every 5 or 6 weeks. I live for the weekends; I'm not eager to give up almost 20% of my Saturdays lying in my driveway under the truck, especially during the winter (too cold), the summer (too hot) or the rest of the year (too many mosquitos). Oops, that means I don't really want to be on my back in the driveway any more than whatever is the minimum! I could pay someone else - but, I'd rather do it myself and keep others out from under my hood. I think minimizing the access of the incompetent and the uncaring to your engine is one of the secrets of long life.
Let's talk minimizing impact on the environment. Nah, that argument won't sell well on this forum, think I'll skip it and go to the next. How about this one:
By the time I throw in oil analysis, and combine it with the fact that I don't feel comfortable going for the really long change intervals, yep, I'm paying a little more. But on another thread is a tale of woe from an engine that broke at 140,000 miles. A problem with extra fuel earlier in the engine life was the culprit; maybe this would have been caught sooner with frequent oil analysis. Maybe not. Maybe my K&N is letting in too much dust; maybe not - but oil analysis every 5k or 10k will keep me from losing too much sleep over this one. I could make a pretty good case that EVERYONE, petro and syn users, should do the oil analysis as cheap insurance. But the fact is most folks don't and the majority will get by without spending the $$ just fine, so I won't try to convince anyone, I'm just saying the synthetic + oil analysis combo works well for me.
For my pattern of "moderate" extended changes and oil analysis, I estimate I'm spending about $500 more per year than with a "regular changes, no analysis" alternative. If I added oil analysis to a petro change schedule, the cost difference would drop to about $350 per year. I'm getting some peace of mind, and I'll probably NOT need to bolt on a new turbo anytime during my ownership of the vehicle, which means another way to keep DC out from under my hood. I'll get to shut down 2 to 3 minutes sooner, multiple times per day, during the hot part of the summer by using 325 instead of 300 as my cue, and I won't have to walk away from my vehicle wondering if this is the day that fancy switch is going to malfunction and leave my engine running. I'll fire right up in the coldest weather, and not need to change my oil with the seasons. And if I keep my "worthless" vehicle 1 or 2 years longer before I get the itch, well, just how much would 35k in the stock market earn in that 2 years, anyway? A lot more than $500 X 10 years, I believe. So now who's being "stupid" with their money? (Answer: NOBODY. We're just making different choices. )
I'm completely happy with my choice. I fully understand that different driving patterns, exposure to different data, different past experiences, or different priorities might lead to a different choice. I feel no need to convert anyone; this is not religion or politics. But I also feel no need to call others "stupid", "suckers", or other names just because their decision in this matter is different than mine. Please return the favor! (most of you already do, and for that I thank you
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2001 ETH, QC, LWB, 4WD, 3. 54, SPA Pyro & Boost, K&N RE-880 w/foam pre-cleaner, ARE Z-series Cab-high shell, Rear ARB locker, and all kinds of synthetic fluids...