At home oil changes
#21
Best advice is UOA. Gut feelings on how long the oil is acceptable are no comparison to spectroscopic and chemical analysis.
#22
My fit has 18k on it now and I have done all the maintenance myself. So far I have changed the oil and rotate the tires 3 times each. I have none all of this without receiving the reminder and I always reset the oil life back to 100%. My question is, because I'm not allowing the MM to alert me that it is time for service, will it still alert me for some of the other items like the air filter or cabin filter or should I change them at some recommended interval?
Not waiting for the MM to 'alert' you tyo change oil - and filter - means you'll get longer life out of yiour Fit. We,ve taken on a project to see iff we can determine the life of a filter by periodically weighing one on our Fit. I suspect 6000 miles may be when the filter weight sdtabilizes, meaning its holding all the contaminants it can and the oil is bypassing but that may be ficticous but well see. In the past we've measured the pressure drop across the filter and we found back then the pressure drop was enough to get at least some bypass by 6000 miles with Mobil 1. We'll see if this says the same. thats what happens when Sheltons are around.
#23
Also, by my calculation, if I assume that I travel at an average speed of 50 mph and an average engine speed of 2000 rpms, to complete 6,000 miles would take 120 hours meaning over 14 million revolutions. I never realized you could rack up so many revolutions so quickly!
#24
Congratulations ! We see so many drivers who have no clue about maintaing any vehicle; they think its like a computer.
Not waiting for the MM to 'alert' you tyo change oil - and filter - means you'll get longer life out of yiour Fit. We,ve taken on a project to see iff we can determine the life of a filter by periodically weighing one on our Fit. I suspect 6000 miles may be when the filter weight sdtabilizes, meaning its holding all the contaminants it can and the oil is bypassing but that may be ficticous but well see. In the past we've measured the pressure drop across the filter and we found back then the pressure drop was enough to get at least some bypass by 6000 miles with Mobil 1. We'll see if this says the same. thats what happens when Sheltons are around.
Not waiting for the MM to 'alert' you tyo change oil - and filter - means you'll get longer life out of yiour Fit. We,ve taken on a project to see iff we can determine the life of a filter by periodically weighing one on our Fit. I suspect 6000 miles may be when the filter weight sdtabilizes, meaning its holding all the contaminants it can and the oil is bypassing but that may be ficticous but well see. In the past we've measured the pressure drop across the filter and we found back then the pressure drop was enough to get at least some bypass by 6000 miles with Mobil 1. We'll see if this says the same. thats what happens when Sheltons are around.
A vehicle is not like a computer, but our vehicles are full of computers, a network, and software written by automotive engineers. It's not a video game.
#27
How about all those revolutions while you are idling? If you drive in the big city or live in the north (warming car to melt snow/ice) this can be considerable. The MM keeps track of them but your method doesn't. How about factoring in for higher rpm cruising, engine temps, hot or cold ambient temperatures, etc. The MM takes all of these in consideration. I would think an Engineer could easily embrace this. If you are truly OCD then do an oil analysis for prior to your next oil change. Many have done an analysis at the MM alert and it has come back that they could have waited longer to change the oil.
I posted before that despite all the fancy algorithms MM or other systems claim to use, you could reduce all of those input variables pretty much to just a single variable of measuring Fuel Consumed and that would pretty much directly correlate to the oil wear.
All the other variables that you mentioned I believe could be accounted for with just a fudge factor assuming worst case scenario+ a little bit extra.
#28
Sorry I should have been more clear, what I meant was, based on what I have observed (approximately 10% drop per 1200 miles) I would probably be at 10k or so when the MM alerted me that it was time for service at 15%. That is much different from what the oil is actually capable of.
#29
How many cars have worn out from NOT changing the oil? Lots. How many from changing it too often? Never heard of one. Sure, modern oils last longer, but I suspect that the very long intervals are as much marketing pitches as engineering decisions.
#30
How about all those revolutions while you are idling? If you drive in the big city or live in the north (warming car to melt snow/ice) this can be considerable. The MM keeps track of them but your method doesn't. How about factoring in for higher rpm cruising, engine temps, hot or cold ambient temperatures, etc.
The MM takes all of these in consideration. I would think an Engineer could easily embrace this. If you are truly OCD then do an oil analysis for prior to your next oil change. Many have done an analysis at the MM alert and it has come back that they could have waited longer to change the oil.
#32
A few models have had sludging problems even following the schedule or very close to it. Iirc, one of corollas had sludging at 500 miles over the recommended millage.
#33
There is some argument that the cars were not maintained according to the recommended schedule, but in any case it was limited to just a few makes and models over these years.
nytimes article.
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