Super-Tech 5W-30 no bueno?

Joined
Feb 25, 2009
Messages
128
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TX
Hello, so my Son's 2009 Subaru came with Mobil SuprSyn in it, and didn't seem to have any issue for the 2,000 miles before I did major maintenance. I switched to WM 5W-30 synthetic during the timing belt service at 105,000. Oil level keeps coming up low after 2,000 miles despite adding more. Mechanic says it's probably burning oil at higher rpm. Without going to a thicker viscosity, which synthetic is known to have the best additve package to help retard this issue? Should I go with Mobil 1 and hope for the best?
 
Joined
Jul 14, 2020
Messages
165
Hello, so my Son's 2009 Subaru came with Mobil SuprSyn in it, and didn't seem to have any issue for the 2,000 miles before I did major maintenance. I switched to WM 5W-30 synthetic during the timing belt service at 105,000. Oil level keeps coming up low after 2,000 miles despite adding more. Mechanic says it's probably burning oil at higher rpm. Without going to a thicker viscosity, which synthetic is known to have the best additve package to help retard this issue? Should I go with Mobil 1 and hope for the best?
oil consumption is a know issue with these engines


go to a 40 weight oil or check the level more often
 

FZ1

Joined
Feb 7, 2008
Messages
5,429
Location
Texas
Hello, so my Son's 2009 Subaru came with Mobil SuprSyn in it, and didn't seem to have any issue for the 2,000 miles before I did major maintenance. I switched to WM 5W-30 synthetic during the timing belt service at 105,000. Oil level keeps coming up low after 2,000 miles despite adding more. Mechanic says it's probably burning oil at higher rpm. Without going to a thicker viscosity, which synthetic is known to have the best additve package to help retard this issue? Should I go with Mobil 1 and hope for the best?
Well, if the supersyn was not burning, there's your oil.
 
Joined
Feb 25, 2019
Messages
1,563
Location
Texas
So you bought a car without knowing the oil grade and possibly the oil level and after 2k miles it didn't seem to be an issue until after you started taking note of it 2k after servicing it?

Are you getting an actual low oil level warning on your dash or did you just decide to check the stick and saw it was low. Could be that the engine was burning just the same but you didn't notice, it had a higher viscosity oil, or it was overfilled by a quart which is common. I do that so I'm still in the middle to top half of the stick after 10k intervals. That's not uncommon in buying a 10y+ and 100k+ known oil consumption problem having vehicle.

If i was trying to sell an old used car that is known for oil burning problems id put 20w-50 in it to shut it up and make it burn less and if they ask I'd say it's whatever thin stuff the manual recommends. They wont know for sure unless they did an analysis which most don't. They can't practically do much after the sale anyway.

I'd just try going to a thicker oil. How much is it burning exactly? and how cold will the vehicle be in since Texas can have warm and cold winters.

For the most part a 10w-40 on your nearby shelves won't be as high saps as a euro 0/5w-40 or 5/15w-40 diesel grade and it being a 2009 is probably still needs to pass emissions so a lower saps oil would be best.

I'd try supertech all mileage, quaker state hm or valvoline hm in 10w-40 first and see what happens. Valvoline says their 10w-40 has 850ppm zn and 770ppm ph so not high.
 

Jarpin

Thread starter
Joined
Feb 25, 2009
Messages
128
Location
TX
Well, I just got it back from the import mechanic for a wheel bearing replacement , and he had to add almost 3 (THREE)! qts of oil to the crankcase to bring it up to level. There's NO oil leaking into the cooling system indicating a HG issue, based on the fact that there are no oil stains on a white paper towel when dipped into the radiator opening. Must be burning. Mechanic recommended BG MOA at next oil change as an additive to increase wear protection on engine internals.
 
Joined
May 18, 2015
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NE US
What is your consumption rate per 1000 miles?

I doubt the BG will do anything except drain your wallet. The oil consumption is likely the reason the car was sold.
Agreed, someone saw the issue and dumped the car is the most likely scenario. Seen a lot of questionable cars sold recently with used car prices so high. Nothing sucks like spending 10 - 14k on something that is already half way to the junkyard. Everyone trying to cash in and inventory sucks.
 
Joined
Dec 26, 2005
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Upper Midwest
Well, I just got it back from the import mechanic for a wheel bearing replacement , and he had to add almost 3 (THREE)! qts of oil to the crankcase to bring it up to level. There's NO oil leaking into the cooling system indicating a HG issue, based on the fact that there are no oil stains on a white paper towel when dipped into the radiator opening. Must be burning. Mechanic recommended BG MOA at next oil change as an additive to increase wear protection on engine internals.
Lol okay then. That’s not the Supertech oil and Mobil 1 isn’t going to fix it. How many miles did it take to get down 3 quarts?

And why are you or the mechanic worried about “wear protection” at this point? All of that makes no sense at all.
 
Joined
May 30, 2010
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14,684
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North Carolina
How do you know what was in the car when you bought it? You don't unless you put it in yourself. Probably heavy oil and lucas syrup. Now that you changed it, its using oil with the normal viscosity stuff.
 
Joined
Jul 10, 2011
Messages
663
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Martinsburg West Virginia
While some cars do better on one brand of oil than another ( I have seen it personally ), there really is no reason for it to all of a sudden start doing that with an oil change. There either was some sort of snake oil or super thick oil in there that was stopping the consumption. When I buy a used car, the second it gets home it gets an oil change, even if it was just done. This way if they were trying to hide anything, the truth will come out immediately and it is going back. If it truly wasn't using oil before, then something was done wrong in the timing belt service that is affecting it, or the crankcase had something in it to slow it down significantly. I would check over the PCV system, that is a lot of oil disappearing and the oil brand isn't at fault.
 
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