Chippy said:
I'll not be investing any money in sample analysis I'd rather spend it directly on fresh oil.
I've got to challenge that statement. If you use the laboratory test route you can actually avoid paying for any oil at all - and have a much better chance of keeping your vehicle in good condition!
I'm not going to explain the logic of how this all works but it's all there in black and white in the SCN. Consider three cases:
Driver 1 - he doesn't know about the program, doesn't have a working SIM, so he just goes in for an Oil Service at 21,000 miles, completely oblivious to what's going on under the bonnet. Goodness knows what his dilution level is by the time he has a service. But he is definitely in the category Mr. Woodcock is trying to protect on page 1 because at some point his engine is likely to seize up. That's what is says on JLR headed paper.
Driver 2 - Has a working SIM and drives normally until the Service Message triggers at 8,000 miles. He presents the car and the dealer changes the oil and filter according to the program. The indicated dilution would have been above 6.1%, the actual dilution probably about 5%. He continues driving until the SIM triggers again, this time at 16,000 miles which is 250 miles too many for the good of his wallet. He must have the oil and filter changed to protect the car but this driver doesn't qualify for the free oil and filter change. He'll be persuaded to have the Oil Service done 5,000 miles early which either ticks off one of his service program freebies or costs him ÂŁ500+.
Driver 3 - He has a slow pull on his pipe, pours some tea and sits down to have a good think about what's really going on. At 7,000 miles he pays for independent oil analysis on a sample he has taken himself and this comes back from the laboratory with a formal recommendation that the oil needs changing immediately because the dilution is 4.7%. He presents the findings to JLR and without question they pay for the subsequent oil and filter change. At the oil change, they find the car's estimated dilution level was 5.7% which is lower than the SIM threshold but they still perform the free oil change because the owner is backed up by an independent expert report. He drives for another 7,000 miles until the odometer reads 14,000 miles and repeats the laboratory test. It comes back exactly as it did the first time with a recommendation that it needs changing. Once again, the oil and filter are changed by the dealer and it's another freebie because the dealer follows the SCN instructions to the letter. On his third charge of fresh oil Driver 3 then completes another 7,000 miles before taking the car in for its 21,000 mile service which he is happy to pay for.
If you were in the second-hand market for a used DS in three years' time which of these three cars would you want most? And which one would you avoid like the plague?