2002 Cavalier; PC 5W-30 dino; 20,979 miles on oil!
- Thread starter addyguy
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Dude, this UOA really isn't that bad! You get the BITOG giant cajones award, that's for sure! Scale it back to 10,000 miles??? People will still be telling you it's too long.
Yeah, I gotta agree, these results aren't as bad as I expected.
I still can't get over the oil not thickening up - other long-dino-OCI's show the oil thickening from oxidization bad after 15k - yet this oil is right where a slightly sheared 30-weight should be!
This run may not have done nearly as miuch 'sludging' as I though it would - after one flush run, engine will most like be okay!
And, BTW, I will definetly be 'scaling back' from here - no more runs like this for the rest of the cars life.
I still can't get over the oil not thickening up - other long-dino-OCI's show the oil thickening from oxidization bad after 15k - yet this oil is right where a slightly sheared 30-weight should be!
This run may not have done nearly as miuch 'sludging' as I though it would - after one flush run, engine will most like be okay!
And, BTW, I will definetly be 'scaling back' from here - no more runs like this for the rest of the cars life.
Addy, i might have missed something... Was there a particular reason why you ran the oil that long? (Link to earlier threads?)
Why not keep going? FOR SCIENCE!
You seem to have a perfect example of how far today's dino oil can last under certain conditions.
I thought the report was decent?
why change a thing? Run that combination as long as you keep the car and document the UOA results along the way.. Oh! and take pics of the internals along the way!
I'd be very interested in the results, as well as the whole BITOG community. I'm shocked by the results, to say the least.
I never expected dino oil to last this long.
Why not keep going? FOR SCIENCE!
You seem to have a perfect example of how far today's dino oil can last under certain conditions.
I thought the report was decent?
I'd be very interested in the results, as well as the whole BITOG community. I'm shocked by the results, to say the least.
You've got some big brass ones.....
I'd assume that the gradual accumulation of silicon caused increased wear rates in the latter miles of your OCI. That's probably the worst thing that happened. I'm surprised your TBN held up as well as it did with a dino oil.
If you ever pull the valve cover off, snap some pictures. Inquiring minds want to know!
I'd assume that the gradual accumulation of silicon caused increased wear rates in the latter miles of your OCI. That's probably the worst thing that happened. I'm surprised your TBN held up as well as it did with a dino oil.
If you ever pull the valve cover off, snap some pictures. Inquiring minds want to know!
Originally Posted By: addyguy
MY comments:
2. I expected the viscosity to be a LOT higher - I thought with a quart of 10W-40 added, and a 20k run, this oil would be well into the 11-13cst range, not barely into the 30-weight range - and this car saw a good, solid 30-mile drive before this sample was taken - oil was HOT.
As I understand it, two competing factors are at play in the long term viscosity change of motor oils; shearing reduces the viscosity whilst oxidation increases it. With most oils, shearing effects seem to dominate over a long OCI, and that is likely what happened in this case.
MY comments:
2. I expected the viscosity to be a LOT higher - I thought with a quart of 10W-40 added, and a 20k run, this oil would be well into the 11-13cst range, not barely into the 30-weight range - and this car saw a good, solid 30-mile drive before this sample was taken - oil was HOT.
As I understand it, two competing factors are at play in the long term viscosity change of motor oils; shearing reduces the viscosity whilst oxidation increases it. With most oils, shearing effects seem to dominate over a long OCI, and that is likely what happened in this case.
I thought that after about 12-15k, oxidization becomes the dominant effect on the oil, causing it to thicken rapidly. I though that, plus using a 40-weight as top-off, would have the oil easily a 40-weight. I'm really suprised the oil is as thin as it was.
As far as the lead that someone commented on, it really doesn't bother me much - TallPaull had an 'incident with his 1995 F150 I-6 that left him with over 400ppm lead, and apparently his engine runs just fine.
Just some thoughts, I've got to make thuis car last, so I am seriously done with abusive OCI's.
As far as the lead that someone commented on, it really doesn't bother me much - TallPaull had an 'incident with his 1995 F150 I-6 that left him with over 400ppm lead, and apparently his engine runs just fine.
Just some thoughts, I've got to make thuis car last, so I am seriously done with abusive OCI's.
Still wanting to know why you did this. Care to share?
I wonder how long someone could go on straight dino oil before the car would stop working right?
Not that bad at all.
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
Originally Posted By: 21Rouge
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
If he had run the oil at a 3000 mile interval, his lead number would average out to around 6.
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
If he had run the oil at a 3000 mile interval, his lead number would average out to around 6.
Originally Posted By: D189379
Originally Posted By: 21Rouge
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
If he had run the oil at a 3000 mile interval, his lead number would average out to around 6.
And don't you think that such a # (for lead) would raise some eyebrows?
Originally Posted By: 21Rouge
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
If he had run the oil at a 3000 mile interval, his lead number would average out to around 6.
And don't you think that such a # (for lead) would raise some eyebrows?
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Originally Posted By: 21Rouge
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
Funny you should mention that...part of the reason i did this UOA WAS to check for coolant....have an external coolant leak from a hose of the HG, just haven't tracked it down yet.....
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
Funny you should mention that...part of the reason i did this UOA WAS to check for coolant....have an external coolant leak from a hose of the HG, just haven't tracked it down yet.....
Originally Posted By: addyguy
Originally Posted By: 21Rouge
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
Funny you should mention that...part of the reason i did this UOA WAS to check for coolant
Then I am surprised Addy that you waited for 20k miles before drawing a sample
Originally Posted By: 21Rouge
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
Funny you should mention that...part of the reason i did this UOA WAS to check for coolant
Then I am surprised Addy that you waited for 20k miles before drawing a sample
Originally Posted By: 21Rouge
Originally Posted By: D189379
Originally Posted By: 21Rouge
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
If he had run the oil at a 3000 mile interval, his lead number would average out to around 6.
And don't you think that such a # (for lead) would raise some eyebrows?
Hey Addy, I just see this other thread resurrected on BITOG showing another Cavalier having taken Amsoil to a 25k mile OCI....your long lost twin brother?
It provides a great comparison to your #s!
https://bobistheoilguy.com/forums/posts/2202770/
No make-up oil and his Pb was 1
For sure take a look at the other wear #s.
Originally Posted By: D189379
Originally Posted By: 21Rouge
Originally Posted By: addyguy
As far as the lead that someone commented on, it really doesn't bother me much
If one is going to be fine with a lead count over 40 (even given an extended UOA) then I don't really see the point of doing a UOA beyond the detection of coolant.
If he had run the oil at a 3000 mile interval, his lead number would average out to around 6.
And don't you think that such a # (for lead) would raise some eyebrows?
Hey Addy, I just see this other thread resurrected on BITOG showing another Cavalier having taken Amsoil to a 25k mile OCI....your long lost twin brother?
https://bobistheoilguy.com/forums/posts/2202770/
No make-up oil and his Pb was 1
For sure take a look at the other wear #s.
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