Quote:
Originally Posted by josiahg52
I have no doubt that in specific circumstances and conditions, that oil can "last" 20k miles. As you say, companies tend to boast the capabilities of their products. I'm guessing the 20k mile claim is based on the additive package concentration and detergents in the clean oil being reduced/consumed at some average and assumed rate. Its probably a strong oil anyway.
Now that I'm driving more than ever, I, too, am interested in extended OCIs. I used to do 6-7500k miles because my trips and use were of shorter durations. Now that I'm driving an hour to and from work, I've pushed my OCI to 9k miles and looking to try 10k miles. I've had my used oil analyzed every time. 20k mile OCI in an auto diesel of our type is too long but 11k is probably safe.
Fram filters get a bad, often deserved, rap. Their cartridge filters are probably better than their canisters. I get OE filters at my dealer for $8 so that's what I use.
To bring this back, it's not your cat!
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josiahg, where did you have your oil analyzed? I would be interested in doing that. Only thing I've found so far is one website that says $60 per test, and you need more than one test to provide a trend. Got to be a better deal out there, I'm sure. Do any of the big lube or tire chains do it, and any idea what they charge? (For the record, my X is not diesel.)
Look, I don't want to advocate anyone burning up their engine. If one feels better about sticking with the conventional 3-5K OCIs and don't mind paying for that "insurance", then by all means they should do so! I'm just relating what I have tried.
And yes, thanks for bringing this back. I hope you are right about it not being my cat. Just more trouble I could blame him for. Only 18 months old and he's already 20 lbs. and eating me out of house & home.
Seriously, one youtube I watched said it usually actually
is the cat when it gives this particular "cat efficiency" DTC. I'm still hoping not and will continue to investigate.
