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2015+ Shelby GT350 Mustang
High Oil Consumption
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<blockquote data-quote="ANGREY" data-source="post: 15943251" data-attributes="member: 188865"><p>Some thoughts here, it'll be comforting for some, troubling for others.</p><p></p><p>I bought the car with just over 8k miles on it. The dealer had obviously changed the oil and actually replaced all four tires (brand new). I drove the car HARD up to 12k before I decided to do my first change. I did the change myself. Checked the oil. I didn't monitor the oil during that period.</p><p></p><p>Right after I bought the car, I installed an oil separator on the passenger side. It fills with a few ounces ever so slowly, just like everyone else.</p><p></p><p>I drove the car HARD in some cases, for 1500 miles and decided I would cringe, close my eyes and check the oil. It's virtually the same reading as when I changed it. I'm seeing no consumption in my first 1500 mile interval. And a guy I know, he's driven HIS car NUMEROUS trips in the same time period cruising the car at 100+ for extended durations, with intermittent hard stints of acceleration. That same guy had no oil consumption in the same interval. Just some accumulation in the separator.</p><p></p><p>This makes me a bit happy, and also a bit concerned. There HAS to be a systematic, mechanical explanation as to why some cars are eating oil and others are not.</p><p></p><p>When you remove use factors (i.e. some baby the car, some flog the car), then you boil it down to either a failure or deviation in assembly or a failure or deviation in material components. I can only assume the oil and the filters are the same (or within manufacturing tolerances) of all these different owner data points.</p><p></p><p>So that means either the assembly line was different for some cars....(either the engine tech seated the rings differently, or something). Also, we've established that it's HIGHLY unlikely that any of these consumption issues are leaks. No one has reported leaks or certainly nothing to the extent as the loss rates being seen (if you were leaking quarts of oil, your whole undercarriage would be filthy, even the back of the vehicle and the rear windshield would be spotted with oil).</p><p></p><p>If it's not leaking, then it's going past the rings. No one is reporting oil in their coolant, so the only place it can be "consumed" is blow by past the rings or windage through the PCV routing. Assuming the catch cans are getting most (if not all) the suspended oil (the designs are pretty good, I can't see how atomized or suspended oil can get through the system).</p><p></p><p>If it's not blowby through the PCV system, which is being captured by everyone with a can, if it's not leaks outside the vehicle and it's not leaks into the coolant system, then it has to be blow by at the rings.</p><p></p><p>I know that the pistons and rings have a material thermal differential (which is why some people are getting piston slap). Aluminum pistons expand and contract at a different rate than the cylinder walls and block. Maybe people are eating oil at startup and cold conditions until the pistons fully warm and expand to seat the rings better.</p><p></p><p>Or maybe the rings just aren't seated properly at the factory. I will admit, I don't run the car until it's all the way warmed past 100F or so. I never get in and just go. I let it warm to 100F coolant temp (at least), so I'll start to keep track of what that generally translates to in cylinder head temp for idling.</p><p></p><p>Something alarming is at play here. Something like they had a flaw in assembly standards/conformance, or some cars got a bad batch of something in the engine rotating components.</p><p></p><p>I can only go back to the experience that older cars burn oil because of the wear and slop that develops over time with ring seating (among other things).</p><p></p><p>Perhaps some of you guys losing lots of oil could do a leak down test and see your compression (perhaps at cold start and then once warm, after driving hard, etc).</p></blockquote><p></p>
[QUOTE="ANGREY, post: 15943251, member: 188865"] Some thoughts here, it'll be comforting for some, troubling for others. I bought the car with just over 8k miles on it. The dealer had obviously changed the oil and actually replaced all four tires (brand new). I drove the car HARD up to 12k before I decided to do my first change. I did the change myself. Checked the oil. I didn't monitor the oil during that period. Right after I bought the car, I installed an oil separator on the passenger side. It fills with a few ounces ever so slowly, just like everyone else. I drove the car HARD in some cases, for 1500 miles and decided I would cringe, close my eyes and check the oil. It's virtually the same reading as when I changed it. I'm seeing no consumption in my first 1500 mile interval. And a guy I know, he's driven HIS car NUMEROUS trips in the same time period cruising the car at 100+ for extended durations, with intermittent hard stints of acceleration. That same guy had no oil consumption in the same interval. Just some accumulation in the separator. This makes me a bit happy, and also a bit concerned. There HAS to be a systematic, mechanical explanation as to why some cars are eating oil and others are not. When you remove use factors (i.e. some baby the car, some flog the car), then you boil it down to either a failure or deviation in assembly or a failure or deviation in material components. I can only assume the oil and the filters are the same (or within manufacturing tolerances) of all these different owner data points. So that means either the assembly line was different for some cars....(either the engine tech seated the rings differently, or something). Also, we've established that it's HIGHLY unlikely that any of these consumption issues are leaks. No one has reported leaks or certainly nothing to the extent as the loss rates being seen (if you were leaking quarts of oil, your whole undercarriage would be filthy, even the back of the vehicle and the rear windshield would be spotted with oil). If it's not leaking, then it's going past the rings. No one is reporting oil in their coolant, so the only place it can be "consumed" is blow by past the rings or windage through the PCV routing. Assuming the catch cans are getting most (if not all) the suspended oil (the designs are pretty good, I can't see how atomized or suspended oil can get through the system). If it's not blowby through the PCV system, which is being captured by everyone with a can, if it's not leaks outside the vehicle and it's not leaks into the coolant system, then it has to be blow by at the rings. I know that the pistons and rings have a material thermal differential (which is why some people are getting piston slap). Aluminum pistons expand and contract at a different rate than the cylinder walls and block. Maybe people are eating oil at startup and cold conditions until the pistons fully warm and expand to seat the rings better. Or maybe the rings just aren't seated properly at the factory. I will admit, I don't run the car until it's all the way warmed past 100F or so. I never get in and just go. I let it warm to 100F coolant temp (at least), so I'll start to keep track of what that generally translates to in cylinder head temp for idling. Something alarming is at play here. Something like they had a flaw in assembly standards/conformance, or some cars got a bad batch of something in the engine rotating components. I can only go back to the experience that older cars burn oil because of the wear and slop that develops over time with ring seating (among other things). Perhaps some of you guys losing lots of oil could do a leak down test and see your compression (perhaps at cold start and then once warm, after driving hard, etc). [/QUOTE]
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