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Bore Scoring Is A Myth? Blackstone Labs Porsche Data Revealed!

Bore Scoring Is A Myth? Blackstone Labs Porsche Data Revealed!

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About this episode

Blackstone Labs’ Joe Adams breaks down Porsche engine wear using oil-analysis data, challenging the internet fear that “bore scoring is inevitable.” Using thousands of samples, he cites low rates of the telltale aluminum/iron/silicon trio: about 2.22% for 3.6, 3.63% for 3.8, ~1.31–1.35% for direct-injected (DFI) variants, and ~0.75% for the 991 3.4. He emphasizes trends over single samples, proper oil selection over additives, and using analysis to guide oil-change intervals and storage practices.

Cars: Porsche 911
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Technical Too Afraid to Ask
Car

Porsche 996

"We cover the bore score rates for not only the 996s and 997s, but I also talked to them about the 991s."

Porsche 996 is a specific generation of the Porsche 911. The episode is talking about a known engine wear problem (“bore scoring”) and how often it shows up in cars like these.

Concept

oil change

"But when you should consider doing an oil change and spoiler alert, it doesn't have to be every year."

An oil change is when you replace the engine oil. It helps keep the engine lubricated, and the episode is asking how often you really need to do it.

Term

oil additives

"We talk about what breaks down with the oil and do additives really matter?"

Oil additives are extra chemicals you add to engine oil to try to improve how it works. The episode is basically asking whether those additives actually help, or if regular maintenance is what matters more.

Term

oil analysis

"Nothing better than oil analysis to help answer those questions... The whole point is that we want you to be able to understand the data that we pull from the sample."

Oil analysis means testing a small sample of your used oil. It can show whether your engine is wearing normally or if something is contaminating the oil.

Company

Blackstone Laboratories

"So let's do this just because people might be coming to this not ever having heard of Blackstone Labs before... Blackstone Laboratories has been in the oil analysis game since 1985."

Blackstone Laboratories is a service that tests used oil. You send in a sample, and they look for signs of engine wear and contamination so you can understand what your car’s oil is telling you.

Term

metal content

"...help you out by explaining the sources of metal content, the signs of contamination, hopefully a lack thereof."

“Metal content” in oil analysis refers to the concentration of metals found in the used oil, which typically come from engine wear. Different metals can point to different wear sources (for example, bearings vs. cylinder components), helping interpret how hard the engine is working internally.

Company

Blackstone Labs

"and Porsche definitely falls in that category, and we can assist owners that are interested, merely by sending us a sample size of three and a half ounces... when you guys do your oil inspections... you can put it up against the sample sets of thousands of other motors"

Blackstone Labs is a service that tests oil you’ve already used in your car. By comparing your results to lots of other engines, they can tell you whether your engine seems to be wearing normally or not.

Term

IMS issues

"We're going to talk about IMS issues with the motors,"

IMS is short for an intermediate shaft part inside some Porsche drivetrains. Some cars can have problems with a bearing there, and if it fails it can cause major damage.

Term

air cooled iteration

"So if it's an air cooled iteration, we're going to have averages for that."

An “air-cooled” Porsche engine uses airflow to keep the engine cool. It’s important because the way the engine runs and wears can be different from water-cooled engines.

Term

bore scoring

"And there's also a worry about bore scoring. And this is something that I know I fret about and I fretted about because I got a bore scope check on my motor..."

Bore scoring is when the inside walls of an engine’s cylinders get scratched or worn. It usually happens when the engine doesn’t have enough good lubrication, so metal starts rubbing instead of gliding.

Term

high aluminum, high iron, and high silicon

"Porsche is unique in that we can see signs of bore scoring in the form of high aluminum, high iron, and high silicon. So when we see these three elements testing high together in these motors..."

They’re talking about lab results that measure tiny amounts of metals and particles. If aluminum, iron, and silicon are all high at the same time, it can point to a specific kind of engine wear or contamination.

Concept

trio of metals as a diagnostic pattern

"The surefire signs because you can have one of these elements a little out of whack, but it takes that trio to really assume a problem of that nature."

Instead of panicking over one weird number in the oil, they look for a matching set of clues. When several metals are high together, it’s much more likely to mean a real internal wear problem.

Concept

track use

"But I would also add that we're seeing a really wide range of ownership in the sense that we're seeing people who are interested in track use populate that average file, people who are not, people who are strictly using their car in the gentlest manner,"

Track use is when you drive the car hard on a circuit. That puts more stress on the engine and oil, so the wear and oil condition can be different.

Concept

pre-buy samples

"We have people who are sending in pre-buy samples where they can't speak to how the motor is taking care of. They can only tell us how they would take care of it."

Pre-buy samples are oil tests you do before buying a used car. They’re meant to help you judge how healthy the engine is and whether it was cared for.

Concept

wear profile

"...down the road, it's not necessarily going to make a lot of metal as it ages either. Once you have that maintenance plan dialed in, and you have stable trends emerge..."

A wear profile is basically how an engine’s wear changes as it gets more miles. The point here is that if you maintain the car well, the wear rate tends to stay predictable.

Term

oil passages

"Maybe there is, you know, sealer that's been clogging oil passages that hasn't left the system. So it's nice to have that starting point, because we can track how things have been evolving, or unfortunately, not evolving for some motors,"

Oil passages are the internal routes that carry oil to the engine parts that need lubrication. If they get clogged, parts may not get enough clean oil.

Term

track time

"You know, I think oftentimes when there's been abrupt changes in operation, someone has modified power, they have done a significant increase in track time. And it's led to some increases that we certainly want to keep an eye on."

“Track time” refers to driving on a racetrack, which typically increases engine stress, heat, and sometimes oil contamination compared with normal street driving. The speaker links abrupt changes like increased track time to changes in oil-analysis results that should be monitored.

Term

track day

"...but did you just do a track day? You know, are there any additives you can put in your oil to try to help maintain?"

A track day is when you drive on a race track for fun. Because you’re pushing the car harder, the oil can look different afterward, so it’s not always a sign of a problem.

Term

used oil levels in the gray area

"...when you're in that gray area and we advise checking back, it means that we can allow some leeway."

“Gray area” refers to oil analysis results that aren’t clearly normal or clearly catastrophic. In that range, the recommendation is often to recheck later because operational factors (like track use or short trips) can temporarily affect readings.

Concept

direct fuel injection

"...In 2009, Porsche came out with a direct fuel injected motor, and it would completely change"

Direct fuel injection means the car sprays fuel straight into the engine’s combustion area. It can affect engine operation and how the oil behaves, so it matters when you’re analyzing engine health.

Term

percentage of samples

"Can you hit me with some numbers? ... the percentage is... when you look at starting with the 3.6 DFI, we're seeing that... in 1.31% of samples."

They’re using inspection results and turning them into percentages—how many cars show the wear signs out of the total checked. It’s meant to show whether the problem is common or rare.

Term

boar scopes

"Be very careful. Get boar scopes. It's a super issue. You're telling me that it's like a rounding error..."

A borescope lets you look inside the engine cylinders without fully tearing the engine apart. It helps confirm whether there’s real cylinder wear.

Concept

1.35%

"...What about the 3.8 liter motor in the 991s? Yeah, so the 3.8, we're only looking at a rate of 1.35%."

They’re quoting another specific risk number: 1.35%. The point is to show the 3.8L version’s bore-scoring rate is still relatively low.

Term

viscosity

"if you're buying an API certified product with the correct viscosity, you can bank on it providing the necessary wear protection."

Viscosity is basically how thick the oil is. Your car’s manual specifies the right thickness so it can protect the engine in both cold and hot conditions.

Term

oil testing

"...you want to know how that oil looks in testing regardless of who you are, what car you have, because how that oil looks in testing could dictate whether or not that oil change interval needs to be shorter..."

Oil testing means sending or checking used oil to see how healthy it still is. The idea is to use the results to decide whether you really need an oil change, rather than just guessing by time.

Term

coolant leak

"...but it's another one of those things that's not a common problem because you're only going to have moisture build up in a modern engine if it has a coolant leak."

A coolant leak means the engine’s antifreeze isn’t staying where it should. If coolant gets into the engine oil, it can cause oil contamination and wear.

Concept

oil breaking down from its job of cleaning and lubricating

"...miles are where we see that metal accumulated. That's where we see the oil actually breaking down from its job of cleaning and lubricating."

As you drive, the oil picks up dirt and the protective chemicals get used up. Eventually it can’t clean and protect as well as it used to.

Term

TBN

"...the TBN that we test would show active add have left. Now, those samples may not have had a ton of mileage, but that's the point."

TBN is a test that shows how much “acid-fighting” ability your oil still has. When TBN drops, the oil is less able to protect the engine from corrosive byproducts.

Term

vacuum pump from the dipstick

"But people don't even have to do a full oil change if they want to take a sample with a vacuum pump from the dipstick and don't change it."

This is a tool that pulls a small amount of oil out through the dipstick. It lets you get a sample without draining all the oil first.

Term

dipsticks

"Of course, the smart people out there are like, well, Derek, Porsche did away with dipsticks quite some time ago. And so would you feel comfortable opening up the oil cap and taking a sample from there?"

A dipstick is the stick you pull out to see if the engine has enough oil. Some newer cars don’t use one, so you may have to sample oil another way.

Term

midstream sample

"if you're in an ideal situation during an oil change, just waiting for a midstream sample that is not so far towards the end, you miss the drain and not right at the beginning where you can get some debris."

A midstream sample is taken after the initial oil has drained and before the last oil comes out, aiming to avoid debris near the drain plug and dilution effects near the end. The speakers describe it as the “picture perfect” approach for more consistent oil analysis.

Term

pleats

"I used to have a guy that I knew that religiously would, when he changed his oil, he pull off his oil filter, cut it open, he'd inspect all the pleats, pleat by pleat, to see if there's"

Pleats are the folded layers inside an oil filter that increase surface area for trapping contaminants. Inspecting pleats “pleat by pleat” is an enthusiast technique to look for trapped debris patterns that may correlate with wear or contamination sources.

Concept

visible metal

"we can of course check it for visible metal and identify the metallurgy... But that's really something that... you can do on your own far cheaper."

Visible metal in oil or a filter indicates that wear debris is large enough to be seen, which typically correlates with more advanced damage. The lab notes it can be evidence of a problem, but oil sampling can detect much smaller, earlier wear particles.

Term

oil sample

"But I think it's something that in general, you can rest on an oil sample telling you the essentials. If you're driving a car, that's really going to be your go to for most everything."

You take a little used oil and send it to a lab. They look for tiny metal particles and other signs of wear, so you can spot engine problems early instead of waiting for something to break.

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