Excellent question! Hmm, Honda, Toyota, BMW, Audi and VW did actually ask for a more standardized gasoline with detergent exceeding federal requirements. Top Tier gasoline is the result of that. Will 93 octane contain more detergent? Maybe! But those car manufacturers have cars that run on regular and premium gas. So, would GDI (esp our Tellys) benefit from premium? Manual suggests "87 or higher". Are detergents present in all grades of gas? Yes. But how much detergent is enough? My son's first car is a 2014/15 Mazda 3. SKYACTIVE--It's another variation of "a little engine that could"--GDI. High compression (more HP), gas conserving (regular gas) and peppy acceleration! What more to ask? Almost 7 years old now but still an exciting car according to him when he last visited me this summer from Boston (400 miles away). Looks like Mazda has so far avoided the pitfalls of GDI (carbon deposit)! That's new technology for you! But when is the precipitous (or gradual?) drop in performance and mpg occur? Did Kia/Hyundai's Atkinson's cycle finally found the fountain of youth in their latest quest for supremacy? Ah, only time will tell (no pun intended)! Some say that 93 octane on cars requiring only 87 is like taking multivitamins--you pee it out whatever is excess (lol). As for me, I'll stick to 87! Maybe 93 from time to time ( since I only drive no more than 5k miles/year) will help overall in the longer haul (watch out those with addictive personalities--it may cost you $)! Thanks!
Excessive oil consumption
- Thread author Marantz4400
- Start date
arattle
Well-known member
93 octane contains the exact same detergents and additives as 87 from the same manufacturer. The only difference is resistance to knock.
From Wikipedia:
An octane rating, or octane number, is a standard measure of a fuel's ability to withstand compression in an internal combustion engine without detonating. The higher the octane number, the more compression the fuel can withstand before detonating. Octane rating does not relate directly to the power output or the energy content of the fuel per unit mass or volume, but simply indicates gasoline's capability against compression. In broad terms, fuels with a higher octane rating are used in higher-compression gasoline engines, which may yield higher power. Such higher power comes from the fuel's higher compression by the engine, and not directly from the gasoline.
Senator20
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the octane is the resistance to detonation
After much reading, I found what may be one of the causes of "excessive" oil consumption on GDI engines! Here's an excellent article which also points to the importance of OCI (Oil Change Intervals). Please note that "Reduced effectiveness of detergency additives limits the oil’s ability to guard against deposits" only means that fuel detergents have limited effects on preventing carbon deposit build up in the intake valves because they are not getting the optimum fuel wash (compared to non-GDI's multiport fuel injection ) as the fuel is directly sprayed into the combustion chambers rather than the non-GDI's multiport fuel injectors spraying the fuel into a manifold leading to intake valves and therefore getting the benefit of the fuel detergents. However, there have been modifications in newer GDI engine design that takes (small) advantage of fuel detergents. So Top Tier gas (still offers some intake valves cleaning but also big benefit to fuel injectors) and Oil Change Intervals play a major role in preventing carbon deposit build up.
The major side-effect of this technology is the increased risk of fuel dilution. As fuel is sprayed into the combustion chamber, it can wash past the rings and down the cylinder walls, into the oil sump. Fuel dilution can cause a number of problems:
• Reduced oil viscosity interferes with formation of a durable lubricating film, inviting wear. Combustion-zone parts are especially prone to wear, including the pistons, rings and liners. Reduced viscosity also negatively affects the oil’s ability to function as a hydraulic fluid, which is critical in engines with variable valve timing.
• Fuel can wash oil from the cylinder wall, causing higher rates of ring, piston and cylinder wear.
• Reduced effectiveness of detergency additives limits the oil’s ability to guard against deposits.
• Increased oil volatility results in higher oil consumption, requiring more frequent top-offs.
• Accelerated oxidation reduces the oil’s service life and requires more frequent oil changes.
GDI & Fuel Dilution
Gasoline direct injection delivers accurate and rapid distribution of atomized gasoline. While traditional fuel-injection systems spray fuel into a manifold, GDI systems locate the injectors in the combustion chamber, which enables much more control over the amount of fuel injected and timing of fuel injection, improving combustion efficiency. Spraying the fuel directly into the chamber also provides in-cylinder cooling, which helps allow higher compression ratios, increasing efficiency. GDI engines use a mixture of 40 parts (or more) air to one part fuel during light loading, while traditional gasoline engines use a mixture close to 14.7 parts air to one part fuel. The 40:1 ratio means less fuel is burned during combustion, resulting in better fuel economy.The major side-effect of this technology is the increased risk of fuel dilution. As fuel is sprayed into the combustion chamber, it can wash past the rings and down the cylinder walls, into the oil sump. Fuel dilution can cause a number of problems:
• Reduced oil viscosity interferes with formation of a durable lubricating film, inviting wear. Combustion-zone parts are especially prone to wear, including the pistons, rings and liners. Reduced viscosity also negatively affects the oil’s ability to function as a hydraulic fluid, which is critical in engines with variable valve timing.
• Fuel can wash oil from the cylinder wall, causing higher rates of ring, piston and cylinder wear.
• Reduced effectiveness of detergency additives limits the oil’s ability to guard against deposits.
• Increased oil volatility results in higher oil consumption, requiring more frequent top-offs.
• Accelerated oxidation reduces the oil’s service life and requires more frequent oil changes.
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I am facing this issue. After 3000 km after every oil change I need to add oil . I contacted kia regarding this and they said there is no oil burn and did a oil consumption text. It was normal . But then I noticed oil decreases after 3000 to 4000 km after oil change. It goes to low . And Kia have done a oil construction text afte 1500 km it was normal. I don’t know what I should do . The vehicle is now 90000k . Running out of warranty.
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G-556355
2020 Telluride Burns about a quart every 600 miles
Rance Junge
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I change my own oil (in my 2022 SX Telluride) Pennzoil Ultra Platinum plus full synthetic. I use BG MOA pn115 additive also since the Genesis dealer in Tulsa, Ok recommended the additive on my GV80 for owner's life of the engine vehicle warranty if used. I did some research on BG MOA and it looked to be a good product. I am on my 2nd oil change on the Telluride using 7500-mile intervals and have been down one-half quart @ 8000 miles.
This is why I chose Pennzoil Ultra Platinum 5W-30 full synthetic oil.
This is why I chose Pennzoil Ultra Platinum 5W-30 full synthetic oil.
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I truly believe that the oil is the key to most service issues for GDI. The right kind at the right time. Thanks.
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no...the design of the gdi engine doesn't let fuel wash over the valves which cleans them...and as was said high octane is just resistance to detonation made for higher compression engines...if your engine isn't knocking on 87 then running 93 is no benefit and it will not give you better gas mileage
The older generation (early 2000) GDI was plagued by intake valves carbon deposits! New technology has been added to allow the intake valves exposure to unburned gasoline for backwash, IMHO. This is why Kia/Hyundai is able to confidently continue their 10 year warranty! As for oil consumption, IMHO, this is par for the course for Tellurides! 300 HP, good fuel mileage and can haul 5k lbs. It can get a little hotter (engine)—a trade off. This is why I check oil level and top off from time to time in between oil changes. I also use the “severe “ maintenance schedule—meaning I change all the changeables (engine and aircon filters including) and mostly the oil and oil filter more often. All of these including using Top Tier gas to stem carbon deposit formation which is common to GDI engines. Thanks.
Senator20
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You know no gasoline hits the back of the intake valve. So they are still get carbon build on them.
I hear you! It’s been in the back of my mind since I bought tge Telluride! Ther was a healthy discussion on this topic (and nany others)! Please bear with me and go to this link which I think offers hope to us who are very much interested to learn more about this issue! Here’s the link! Thanks! Question about carbon buildup on intake valves - 1.6 DI
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I have a 2020 with about 39k miles, oil change every 6000ish miles. It was burning approximately 1qt every thousand miles (always consumed some oil but has recently become much worse) and the engine was making a knocking sound when accelerating (recent development). I had the dealer check it twice and they documented the oil consumption and did a diagnostic (keeping the car for several days). KIA approved replacement of the engine. It took about 10 days to get an engine and perform the work. I just got it back 2 days ago. Engine sounds much quieter. I’m going to regularly check the oil level and document it carefully from now on. I’ll continue to have the dealership do the oil changes to make sure they keep a record of everything and because they treated me right and advocated for me with corporate. Bottom line, I think these engines have bad components that allow oil to blow past into the combustion chamber. The KIA tech says that he replaces many engines, much more so than when he worked at other brands. They (the engines) are nowhere near as well built as the twenty or so Hondas, Toyotas or Nissans that I have owned over the years.
May I aak how you check your oil level? Thanks!
Tellmeride
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dip stick
Looking to cover or replace the KIA emblems on your Telluride? Look no further than right here in our own forum store - where orders are shipped immediately!
I asked because there was a discussion where I commented that the dipstick tube creates a vacuum which makes it appears the oil level is low when dipstick is initially pulled especially in the morning (or after several hours after driving)! The correct level is then restored upon reinsertion of the dipstick. Thanks.
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Tellmeride
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Of course, you pull it out and wipe it clean, insert it back in and pull it out for the second time for the accurate reading. I know, this comments sounds very NC-17.
i agree...i fit all oil into a 5qt jug after a 7500 mile oil change...car only has 21k on it...engines being swapped is a major inconvenience and can introduce other issues as it's done by mechanics and not in a factory...to me that means the product isn't great
i was going to add to this but i shouldn't
Nightfall22
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I have a 2022 Telluride SX and must be lucky as it has consumed very little oil if any. I have the oil changed at 7K miles using a Kia filter and Mobile 1 Full Synthetic. It about to roll over 17k miles. I checked the oil yesterday and it’s on the top mark. So, it appears not to affect all engines. It does have the drive belt that is on recall and it’s being replaced as soon as the dealership gets the new belt. I was told the dealerships don’t stock the replacement belt as they are VIN specific (which I doubt). Too bad they don’t provide the part number for the affected belt so you can check it yourself and save a trip.
without doing it yourself and collecting it in a jug you wouldn't know the volume drained if you have someone do it at a shop cause they don't quantify it and they don't tell you exactly how much they put in either...you would have to check it after your oil change and right before your next oil change without adding any oil in between to know if it's consumed any but you still won't be able to quantify it
