If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Burning Oil
Elle wrote:
> On Sep 11, 8:41 pm, jim beam > wrote: >> here's something to consider - an old "trick of the trade" is to use >> some of that crappy "stop oil consumption" additive when a dealer sells >> a known dud car. it works fine for a while, then, once a few months >> have gone by and it's no longer a quick come-back, it breaks down and >> oil consumption rises again. > > I was not aware that such additives existed but I can certainly > believe this is what happened and I got sold a car with a way worn > engine. This may be a lesson of used car buying, even with a clean > title and second owner status. Worst case I guess I may live with the > oil consumption and then at some point chase down an engine to swap > in. > > I will keep this thread updated. There are two types of additives to lower oil consumption. One swells the valve seals; if you did the seal replacement right then you can rule that out. The other kind thickens the oil to slow blow-by past the rings. That would have been removed not long after the oil change. You can do a simple test to see if it's worn rings: pull all the plugs and the air filter, then run a compression test with the throttle wide open. If you have worn rings OR valves, the compression will be low. Then squirt about a tablespoon of higher-weight oil like SAE 80 or 90 into each cylinder and repeat the test. If the compression shoots up, you have worn rings. It if only rises slightly or not at all it's worn valves. |
Ads |
#12
|
|||
|
|||
Burning Oil
Leftie wrote:
> Elle wrote: >> On Sep 11, 8:41 pm, jim beam > wrote: >>> here's something to consider - an old "trick of the trade" is to use >>> some of that crappy "stop oil consumption" additive when a dealer sells >>> a known dud car. it works fine for a while, then, once a few months >>> have gone by and it's no longer a quick come-back, it breaks down and >>> oil consumption rises again. >> >> I was not aware that such additives existed but I can certainly >> believe this is what happened and I got sold a car with a way worn >> engine. This may be a lesson of used car buying, even with a clean >> title and second owner status. Worst case I guess I may live with the >> oil consumption and then at some point chase down an engine to swap >> in. >> >> I will keep this thread updated. > > > There are two types of additives to lower oil consumption. One swells > the valve seals; if you did the seal replacement right then you can > rule that out. The other kind thickens the oil to slow blow-by past the > rings. That would have been removed not long after the oil change. You > can do a simple test to see if it's worn rings: pull all the plugs and > the air filter, then run a compression test with the throttle wide open. > If you have worn rings OR valves, the compression will be low. Then > squirt about a tablespoon of higher-weight oil like SAE 80 or 90 into > each cylinder and repeat the test. If the compression shoots up, you > have worn rings. It if only rises slightly or not at all it's worn valves. valves don't affect oil consumption. |
#13
|
|||
|
|||
Burning Oil
jim beam wrote:
> Leftie wrote: >> Elle wrote: >>> On Sep 11, 8:41 pm, jim beam > wrote: >>>> here's something to consider - an old "trick of the trade" is to use >>>> some of that crappy "stop oil consumption" additive when a dealer sells >>>> a known dud car. it works fine for a while, then, once a few months >>>> have gone by and it's no longer a quick come-back, it breaks down and >>>> oil consumption rises again. >>> >>> I was not aware that such additives existed but I can certainly >>> believe this is what happened and I got sold a car with a way worn >>> engine. This may be a lesson of used car buying, even with a clean >>> title and second owner status. Worst case I guess I may live with the >>> oil consumption and then at some point chase down an engine to swap >>> in. >>> >>> I will keep this thread updated. >> >> >> There are two types of additives to lower oil consumption. One >> swells the valve seals; if you did the seal replacement right then >> you can rule that out. The other kind thickens the oil to slow blow-by >> past the rings. That would have been removed not long after the oil >> change. You can do a simple test to see if it's worn rings: pull all >> the plugs and the air filter, then run a compression test with the >> throttle wide open. If you have worn rings OR valves, the compression >> will be low. Then squirt about a tablespoon of higher-weight oil like >> SAE 80 or 90 into each cylinder and repeat the test. If the >> compression shoots up, you have worn rings. It if only rises slightly >> or not at all it's worn valves. > > valves don't affect oil consumption. Valve seals do, however. I was assuming that worn valves would be leaky as well, but maybe not. |
#14
|
|||
|
|||
Burning Oil
On 09/13/2009 03:39 AM, Leftie wrote:
> jim beam wrote: >> Leftie wrote: >>> Elle wrote: >>>> On Sep 11, 8:41 pm, jim beam > wrote: >>>>> here's something to consider - an old "trick of the trade" is to use >>>>> some of that crappy "stop oil consumption" additive when a dealer >>>>> sells >>>>> a known dud car. it works fine for a while, then, once a few months >>>>> have gone by and it's no longer a quick come-back, it breaks down and >>>>> oil consumption rises again. >>>> >>>> I was not aware that such additives existed but I can certainly >>>> believe this is what happened and I got sold a car with a way worn >>>> engine. This may be a lesson of used car buying, even with a clean >>>> title and second owner status. Worst case I guess I may live with the >>>> oil consumption and then at some point chase down an engine to swap >>>> in. >>>> >>>> I will keep this thread updated. >>> >>> >>> There are two types of additives to lower oil consumption. One swells >>> the valve seals; if you did the seal replacement right then you can >>> rule that out. The other kind thickens the oil to slow blow-by past >>> the rings. That would have been removed not long after the oil >>> change. You can do a simple test to see if it's worn rings: pull all >>> the plugs and the air filter, then run a compression test with the >>> throttle wide open. If you have worn rings OR valves, the compression >>> will be low. Then squirt about a tablespoon of higher-weight oil like >>> SAE 80 or 90 into each cylinder and repeat the test. If the >>> compression shoots up, you have worn rings. It if only rises slightly >>> or not at all it's worn valves. >> >> valves don't affect oil consumption. > > > Valve seals do, however. I was assuming that worn valves would be leaky > as well, but maybe not. read the thread - they've been replaced already. |
#15
|
|||
|
|||
Burning Oil
On Sep 11, 7:18*pm, jim beam > wrote:
> also, do a common-sense blow-by test on the motor. *with the engine at > working temp, carefully unscrew the oil filler cap. *if the engine's > breathing right, and you don't have a compression/wear problem, you'll > get a bit of chuff out of the hole, [and some oil spray]. *if there's > something [badly] wrong, either the cap will want to shoot out of your > hand as you get close to removal, or you can feel some vacuum if you > have your hand over the hole. *what you /should/ feel is a reasonable > degree of positive pressure. Did this test. No shooting of the cap at all, nor any vacuum. With my hand on the fill hole, there was a pulsing positive pressure--chuffing as you wrote--and oil spraying/slopping onto my hand. I gather this is not conclusive but a crude test for seriously bad compression, right? I expect to get an inexpensive compression tester soon and see what this yields. |
#16
|
|||
|
|||
Burning Oil
On 09/13/2009 06:55 AM, Elle wrote:
> On Sep 11, 7:18�pm, jim > wrote: >> also, do a common-sense blow-by test on the motor. �with the engine at >> working temp, carefully unscrew the oil filler cap. �if the engine's >> breathing right, and you don't have a compression/wear problem, you'll >> get a bit of chuff out of the hole, [and some oil spray]. �if there's >> something [badly] wrong, either the cap will want to shoot out of your >> hand as you get close to removal, or you can feel some vacuum if you >> have your hand over the hole. �what you /should/ feel is a reasonable >> degree of positive pressure. > > Did this test. No shooting of the cap at all, nor any vacuum. With my > hand on the fill hole, there was a pulsing positive pressure--chuffing > as you wrote--and oil spraying/slopping onto my hand. as it should be. > > I gather this is not conclusive but a crude test for seriously bad > compression, right? right. > I expect to get an inexpensive compression tester > soon and see what this yields. based on the above, i guess you're looking at either worn rings or the breather system. fingers crossed on the latter. this is not something i've tested, just suppose, but the oil consumption in my d15 engine has dropped substantially compared to when i first got it and after i'd fixed the leaks. my choice of oil has meant that pretty much all of the gunk and deposits in the engine have dissolved compared to the state it /was/ in. if this extends to the oil control rings, which do tend to accumulate stuff like this, maybe they're free to seal better, and thus reduce consumption? if that's true, and it is oil rings, maybe you should stick with this engine for a while and see what happens as your use of mobil 1 cleans things up. |
#17
|
|||
|
|||
Burning Oil
I think what Jim Beam indicated is most likely closer to the truth.
Here in Michigan one can buy a product called "CD-2 Helps Stop Oil Burning" - available in any supermarket for $3 or so. You put a bottle of that (if I recall, about 6 oz) with the oil change, and any oil burning stops ..... until the next oil change. Dishonest folks who want to dump/sell an old car with a worn engine will use this product, and the prospective buyer will never know it unless one is really careful about examining the car. Happened to me many years ago when I bought my first car as an unsuspecting (and naive) student (a used 83 Civic 1300SE). The car ran fine until the first oil change ... then, the same symptoms.... After learning from a sympathetic "Pro" as to what could have happened, I had to start using this CD-2 stuff with every oil change, and the car ran fine for about 40,000 miles until the blow-by became too much to handle (and one piston blew anyway). I was using 10W-30 dyno oil (Quaker State) with CD-2 and the CD-2 did its job almost to the very end..... If this may be the case, you can try some of this additive and see what happens ... you may be able to get a bunch of miles out of the car as I did...... Good luck! On Sep 11, 11:11*pm, Elle > wrote: > On Sep 11, 8:41*pm, jim beam > wrote: > > > here's something to consider - an old "trick of the trade" is to use > > some of that crappy "stop oil consumption" additive when a dealer sells > > a known dud car. *it works fine for a while, then, once a few months > > have gone by and it's no longer a quick come-back, it breaks down and > > oil consumption rises again. * > > I was not aware that such additives existed but I can certainly > believe this is what happened and I got sold a car with a way worn > engine. This may be a lesson of used car buying, even with a clean > title and second owner status. Worst case I guess I may live with the > oil consumption and then at some point chase down an engine to swap > in. > > I will keep this thread updated. |
#18
|
|||
|
|||
Burning Oil
On 09/13/2009 04:34 PM, Leftie wrote:
> jim beam wrote: >> On 09/13/2009 03:39 AM, Leftie wrote: >>> jim beam wrote: >>>> Leftie wrote: >>>>> Elle wrote: >>>>>> On Sep 11, 8:41 pm, jim beam > wrote: >>>>>>> here's something to consider - an old "trick of the trade" is to use >>>>>>> some of that crappy "stop oil consumption" additive when a dealer >>>>>>> sells >>>>>>> a known dud car. it works fine for a while, then, once a few months >>>>>>> have gone by and it's no longer a quick come-back, it breaks down >>>>>>> and >>>>>>> oil consumption rises again. >>>>>> >>>>>> I was not aware that such additives existed but I can certainly >>>>>> believe this is what happened and I got sold a car with a way worn >>>>>> engine. This may be a lesson of used car buying, even with a clean >>>>>> title and second owner status. Worst case I guess I may live with the >>>>>> oil consumption and then at some point chase down an engine to swap >>>>>> in. >>>>>> >>>>>> I will keep this thread updated. >>>>> >>>>> >>>>> There are two types of additives to lower oil consumption. One swells >>>>> the valve seals; if you did the seal replacement right then you can >>>>> rule that out. The other kind thickens the oil to slow blow-by past >>>>> the rings. That would have been removed not long after the oil >>>>> change. You can do a simple test to see if it's worn rings: pull all >>>>> the plugs and the air filter, then run a compression test with the >>>>> throttle wide open. If you have worn rings OR valves, the compression >>>>> will be low. Then squirt about a tablespoon of higher-weight oil like >>>>> SAE 80 or 90 into each cylinder and repeat the test. If the >>>>> compression shoots up, you have worn rings. It if only rises slightly >>>>> or not at all it's worn valves. >>>> >>>> valves don't affect oil consumption. >>> >>> >>> Valve seals do, however. I was assuming that worn valves would be leaky >>> as well, but maybe not. >> >> read the thread - they've been replaced already. > > Read my reply again: "One swells the valve seals; if you did the seal > replacement right then you can rule that out." Ah, usenet... why raise it at all if the o.p. had already ruled it out? [rhetorical] read the thread! |
#20
|
|||
|
|||
Burning Oil
jim beam wrote:
> On 09/13/2009 03:39 AM, Leftie wrote: >> jim beam wrote: >>> Leftie wrote: >>>> Elle wrote: >>>>> On Sep 11, 8:41 pm, jim beam > wrote: >>>>>> here's something to consider - an old "trick of the trade" is to use >>>>>> some of that crappy "stop oil consumption" additive when a dealer >>>>>> sells >>>>>> a known dud car. it works fine for a while, then, once a few months >>>>>> have gone by and it's no longer a quick come-back, it breaks down and >>>>>> oil consumption rises again. >>>>> >>>>> I was not aware that such additives existed but I can certainly >>>>> believe this is what happened and I got sold a car with a way worn >>>>> engine. This may be a lesson of used car buying, even with a clean >>>>> title and second owner status. Worst case I guess I may live with the >>>>> oil consumption and then at some point chase down an engine to swap >>>>> in. >>>>> >>>>> I will keep this thread updated. >>>> >>>> >>>> There are two types of additives to lower oil consumption. One swells >>>> the valve seals; if you did the seal replacement right then you can >>>> rule that out. The other kind thickens the oil to slow blow-by past >>>> the rings. That would have been removed not long after the oil >>>> change. You can do a simple test to see if it's worn rings: pull all >>>> the plugs and the air filter, then run a compression test with the >>>> throttle wide open. If you have worn rings OR valves, the compression >>>> will be low. Then squirt about a tablespoon of higher-weight oil like >>>> SAE 80 or 90 into each cylinder and repeat the test. If the >>>> compression shoots up, you have worn rings. It if only rises slightly >>>> or not at all it's worn valves. >>> >>> valves don't affect oil consumption. >> >> >> Valve seals do, however. I was assuming that worn valves would be leaky >> as well, but maybe not. > > read the thread - they've been replaced already. Read my reply again: "One swells the valve seals; if you did the seal replacement right then you can rule that out." Ah, usenet... |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
96 SL1 burning oil... Suggestions? | SMoo | Saturn | 15 | August 9th 06 11:30 AM |
VW says burning oil is acceptable | 99Passat | VW water cooled | 15 | April 20th 06 05:23 AM |
93 SL-1 oil burning help | Chris | Saturn | 1 | March 11th 05 02:23 PM |
99 M3 burning oil? | Kanwar Dhaliwal | BMW | 2 | January 6th 05 08:25 PM |
Burning oil/PCV valve | Lee3333 | Saturn | 2 | September 11th 04 07:53 PM |