Engine oil analysis results

[Steve@Avantgarde]

HI Steve, would there be any benefit using Tunap as I change oil every 8k?
Also Millers suggested I change oil from 5W30 to 5W40 due to the "extra protection" this may offer. Have you any experience of this?
Thanks for you help

It would certainly be an interesting exercise to carry out what difference it makes. The Tunap detergent I use certainly drags quite a lot of carbon out of the engine.

 

[DSK]

What mileages has the oil done when you are using this? Have you also also used it on the direct injection petrol engines with good results?

If it works as you say I may have to try a can on the cls219 which has seen an oil change every 5k all it’s life. It’s now on 90k. My only reservation about flush products is if it dislodged anything in turn causing a catastrophic problem.

My w221 had an engine oil flush with an oil change just before I bought it. Engine is still sweet and tight, pulls like they do when new, uses no oil, no smoke etc, so whatever they used didn’t do any harm. This should only be better being gentle on seals and seeing as I’ve done two service A’s in 10k, I know it’s as good as it gets. End of summer I will have done about 1,500 miles when it gets it’s next service A (hoping current garage fixes it and then I can take it down to one of the forum supported ones).


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[sonic]

I have owned cars for 56 years & up to 20 years ago did my own servicing. Oil changes were done at the manufactures recommended millage normally 12K miles using Duckhams oil mostly.
About half of those cars had over 100K miles on the clock when sold, & I haven't had a single engine failure.
I have owned 2 CLK's a 200K 2001 & a 270CDI 2003. The 200K was sold at 115K miles & the 270CLK at 120K miles. At that time servicing was about every 17K miles.
So was I just lucky?

 

[oigle]

I'm sure that, if an additive would make oils better, the oil manufacturers would be all over it. They all claim to be better than the others....if a new additive would ensure this, they would be lining up. Use well regarded brand along with grades as recommended by car manufacturer and you can't do any better. Save a few quid/dollars while you are at it....
Oil filters are a profit centre for retailers. When you see folk like Fiat telling you to change filters at 40000km.......
I recall Shell doing a filter test many years ago on a group of taxis in Oz., using the then new X100 oils. Ran them for a year, changing oil as recommended by Ford at 6000 mile intervals. The filters were not changed. After a year and 90000 miles, the engines and filters were pulled apart. Engine wear has negligible and filters were at half life...go figure.

 

[ajlsl600]

My experience of sos. Scheduled oil sampling is, that it has to run over some decent period to establish useful info ideally from new. A random test establishes little useful info. Unless it find significant copper, iron. In many ways and how I do it. I interview my oil filters, I cut them open, wash well in petrol and pas liquid thru a clean white cloth Yr eyes provide the sos. And any significant issue looming.

 

[DSK]

100/150k should be a trouble free walk in the park and easily doable with big oil change intervals. The disAstra and E350 I put 98k on each, in 3yrs and only did the bs dealer services on were running well and I know they would do more easily. Probably better engines with less chocolate parts like lots of modern stuff has that many specialists say to change the oil every 5k on. So the quality of engineering plays a part as well as the oil change frequency. All the modern stuff I trade I seek out cars that have been genuinely driven less seeing sun 10k annual oil changes. Anything over that, I’m not touching. They certainly would have sounded and performed better from cold had they had the standard DSK all out servicing the rest of my fleet has.

However as age and miles set it in, then things like the noise, leaks, smoke, wear etc show even if a car seems to drive fine. I can assure one would would not believe how silent, tight, no leaks, no smoke, no oil burning, from cold they are as slick as when they warm, and the pace delivered by my 30/25 yr old stuff, hence why nothing can touch it as they appear to have been built from granite, easy OTT maintenance and everything modern I have tried, traded and owned just falls apart in comparison. This why no two used cars of any age/miles are the same.


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[ajlsl600]

Today a good used is a lottery. One is never sure on what electric, electronic gremlins are at play, frankly same when new, just its makers prob for a, while. Modern stuff is designed to fail, designed to cost shed loads for parts, aslly, s cos can't get sepperate bits and shed loads to insure because of the inflated makers spares costs often with no understandable link to the real cost of making the pts, plastic bumpers near a grand, come on prob £30 to make! . We are forced, almost, to be commercial lemmings with anything modern, I have noticed big time how. Near all stuff is made to a min material, questionable structurally std and max price. A lot barely does what it was bought for.