5w30 vs high mileage vs 40 weight for oil burnoff - 6MT.net Infiniti G35/G37/GTR Forums
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post #1 of 18 Old 06-28-2012, 12:49 PM Thread Starter
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Question 5w30 vs high mileage vs 40 weight for oil burnoff

I am curious how many owners use a different oil grade than 5w30?

Also, has anyone switched to using a high mileage oil?

My next oil change will be 80k and I have always had minor oil consumption ~1 qt every 3k oil change or so. I have a short commute so there are a lot of start/stops in that interval.

I am debating between switching viscosity, 5w40 if I can find it, vs trying a high mileage oil. Mobil 1 is my current brand so Mobil 1 high mileage (75k+).

Mobil 1 High Mileage 5W-30

'06 G35 6MT Sedan. Stillen intake, z-tube, sways, slotted rotors, dual exhaust, 5/16 spacer, d-spec shocks. Legal tints are only as good as they sound. [Pending: 40k miles until stock then sell?]
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post #2 of 18 Old 06-28-2012, 02:30 PM
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I still use synthetic 5w-30 in my sedan. It just turned 134k miles. But it doesn't consume oil.

Remember that the number before the "w" only matters when it's 32 degrees or lower. 5w-30 and 10w-30 will behave the same in the summer time.

'06 Autumn Copper FX35, '11 Alpine White Sentra & 2016 Red Hot Camaro 2SS
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post #3 of 18 Old 06-28-2012, 03:03 PM Thread Starter
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Yea, the maintenance guide says 10w30/10w40 if it doesn't get below 0 F which it typically doesn't in MD. But because I make a lot of short trips, the 5w would be nice to keep it lubricated and warming up quicker.

I think I'll try the 5w-30 high mileage oil for a year and keep a close eye on it. If not just set a reminder at 1/2 of my oil change interval to add a quart or eventually try 5w40 to see if I notice a difference.

I slammed on my brakes at a light (could have made the light but it is just as fun to brake hard as it is accelerate) and my oil light came on for a second.. at that point I realized I hadn't topped it off this interval.

'06 G35 6MT Sedan. Stillen intake, z-tube, sways, slotted rotors, dual exhaust, 5/16 spacer, d-spec shocks. Legal tints are only as good as they sound. [Pending: 40k miles until stock then sell?]
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post #4 of 18 Old 07-10-2012, 04:46 PM
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I've got about 117k miles and have used the high mileage 5w-30 for a while. I still burn about half a quart every 2000-3000 miles. Let us know if you try the 5w-40. I'm curious how that turns out.

05 TB Sedan 6MT - Z tube, JWT pop-charger, Hotchkis sways, Tokico D-specs, Z & G coupe springs (f/r), Borla true dual cat-back
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After thinking about it for a bit, my concern would be oil pressure. The 40 weight oil is going to cause higher oil pressure at operating temps, which might pose a problem to the aging valves/seals/etc.

05 TB Sedan 6MT - Z tube, JWT pop-charger, Hotchkis sways, Tokico D-specs, Z & G coupe springs (f/r), Borla true dual cat-back
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post #6 of 18 Old 07-10-2012, 08:20 PM
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SpecialtyZ swears by 0w40 for G's, which they work on quite a bit.

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I used the Mobil 1 0w-40 when I had the supercharger with no problems.

'06 Autumn Copper FX35, '11 Alpine White Sentra & 2016 Red Hot Camaro 2SS
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I may be using it with a ST soon.

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post #9 of 18 Old 07-11-2012, 09:01 AM Thread Starter
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Quote:
Originally Posted by trentor View Post
After thinking about it for a bit, my concern would be oil pressure. The 40 weight oil is going to cause higher oil pressure at operating temps, which might pose a problem to the aging valves/seals/etc.

The 2006 G manual says 5W-30 Preferred -20 - 100+F, 10W-30 / 10W-40 0 - 100+F.

So it looks like 40 would be fine either way, they just care about the cold viscosity based on the current ambient temperature.

If I was in a more consistently warm client, I'd probably use 0w-40 as well. The 5W-40 seems to be labeled for turbos/diesels... Even the mobil1 5w-30 high mileage wasn't in the 5qt bottle.

'06 G35 6MT Sedan. Stillen intake, z-tube, sways, slotted rotors, dual exhaust, 5/16 spacer, d-spec shocks. Legal tints are only as good as they sound. [Pending: 40k miles until stock then sell?]
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post #10 of 18 Old 07-11-2012, 06:22 PM
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Good to know. Thanks. Mobil1 synthetic 5w-30 does come in the 5qt container in both regular and high mileage blends. I get it at Walmart for about $26.

05 TB Sedan 6MT - Z tube, JWT pop-charger, Hotchkis sways, Tokico D-specs, Z & G coupe springs (f/r), Borla true dual cat-back
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post #11 of 18 Old 12-24-2012, 05:58 PM Thread Starter
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Default 10w40

Just picked up some 10w40 mobil 1 high mileage for this oil change. Burned more oil than expected on a shorter road trip this past month. It is a little cold in MD but shouldn't get out of the recommended range for 10w40. If it is below 0F I will call in sick

I'd get 5w40 but mobil 1 always says turbo diesel oil, and I am not sure if they vary the additives for such. It is also a 4qt bottle, odd.

I saw 0w40 at Advanced Auto Parts, but all of their oil was $37 and Walmart is next door for <$26. Plus that 0 makes me uneasy.

I am at ~84k miles. Now the only issue will be verifying if it is actually helping with that crappy dipstick.

'06 G35 6MT Sedan. Stillen intake, z-tube, sways, slotted rotors, dual exhaust, 5/16 spacer, d-spec shocks. Legal tints are only as good as they sound. [Pending: 40k miles until stock then sell?]
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post #12 of 18 Old 12-25-2012, 01:04 AM
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~LOL

I've seen the VQ dipstick called "the Rubik's Cube of dipstick designs". I thought that was pretty concise.

As per diesel oil, the TBN is typically higher on those and many people have converted to using diesel motor oil including the synthetics. TBN range is 6 to 14 and among additives, is the measure of how long you can run your oil based on a test for TBN after xx miles of use.

If you are not interested in extending the oil change frequency, it's really not a big deal but in any case, you can have any motor oil sample tested just for the fun of it.

My preference is using Rotella in my motorcycle (syn or regular) because it's safe in the wet clutch whereas many other typical motor oils have additives that can fuss it up. Buying a m/c specific oil is as expensive or more so than the Rotella T Synthetic, so that's a no-brainer.

For the car.... In my case, the cost/benefit of more expensive synthetic oil and longer intervals versus normal priced oil used in the 3000 to 5000 mile range is not any difference. I'd rather have a fresh filter/fresh oil at that point anyways. If I were racing the car or really stomping on it more often, I'd go the synthetic for cheap insurance if nothing else. Part of my decision is based on my free dealer oil changes.
I go in at 3k everytime just because.

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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post #13 of 18 Old 12-26-2012, 09:31 AM Thread Starter
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Default 10w40 in the "cold"

So far so good. It has been hanging around 32F here and dipping a little lower. Cold starts seems to be fine though with 10w40. Good to know as I was going to go to a 5 or 10w40 this summer. Probably going to stick to 10w40 all year. If 10w felt rough, I thought about 50/50 10w40 with 0w40... in lieu of 4qt bottles of turbo diesel 5w40...

Will see if it helps with oil consumption at all. Although I read this post as well:

</title> <link rel="shortcut icon" href=/images/"favicon.ico" > <link rel="icon" type="image/gif" href=/images/"animated_favicon1.gif" > <script type="text/javascript"> </script> <script type="text/javascript" src="http://www.freshalloy.com/clientscr

"From the best we can determine at the dealer, the issues with oil consumption on the 05-07 M/T g35's has to do with the piston rings allowing oil to be pulled past the rings on higher RPM decel while in gear. These engines have an exhaust valve retarder that may be creating more vacuum inside the cylinders off throttle. This has not been directly confirmed but is our best guess from what we know."

So I will probably be doing less downshifting/deceleration with the engine now. Sucks to have a manual and have to avoid that...

My guess would be they are going to avoid documenting the piston rings as an issue so they do not have to do a mass recall of any sort...

'06 G35 6MT Sedan. Stillen intake, z-tube, sways, slotted rotors, dual exhaust, 5/16 spacer, d-spec shocks. Legal tints are only as good as they sound. [Pending: 40k miles until stock then sell?]

Last edited by chodanics; 12-26-2012 at 09:39 AM.
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post #14 of 18 Old 12-24-2013, 05:41 AM
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How often you change oil at your g35?
Is it synthetic you are using?

Quote:
Originally Posted by bachman View Post
~LOL

I've seen the VQ dipstick called "the Rubik's Cube of dipstick designs". I thought that was pretty concise.

As per diesel oil, the TBN is typically higher on those and many people have converted to using diesel motor oil including the synthetics. TBN range is 6 to 14 and among additives, is the measure of how long you can run your oil based on a test for TBN after xx miles of use.

If you are not interested in extending the oil change frequency, it's really not a big deal but in any case, you can have any motor oil sample tested just for the fun of it.

My preference is using Rotella in my motorcycle (syn or regular) because it's safe in the wet clutch whereas many other typical motor oils have additives that can fuss it up. Buying a m/c specific oil is as expensive or more so than the Rotella T Synthetic, so that's a no-brainer.

For the car.... In my case, the cost/benefit of more expensive synthetic oil and longer intervals versus normal priced oil used in the 3000 to 5000 mile range is not any difference. I'd rather have a fresh filter/fresh oil at that point anyways. If I were racing the car or really stomping on it more often, I'd go the synthetic for cheap insurance if nothing else. Part of my decision is based on my free dealer oil changes.
I go in at 3k everytime just because.
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post #15 of 18 Old 12-24-2013, 02:38 PM
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Quote:
Originally Posted by G3500 View Post
How often you change oil at your g35?
Is it synthetic you are using?
In my case, I have a few considerations others may not;

3000 miles rolls up slow like maybe every 6 months and I get free LOF at the dealer just up the road so it makes no sense for me to pay $ and have it done. No synthetic in my case.

IMO, this means the advantages of the high tech oil won't really benefit me b/c Syn oils can run longer w/o breakdown but I get a fresh oil change and new filter at 3k anyways.
The one benefit I do enjoy is a fresh filter at 3000 because I've never been that confident in a 7000 mi oil filter --even if/when one runs syn oil that proves to be fine to 7000 and +.

Everything I've read on motor oil by those that test it and know more about it's chemistry make me feel confident that it's difficult to go wrong if you use a brand name, the correct viscosity for your climate and temperatures and consider the cost of benefits of synthetic if you do track days, run the car hard or just want a bit of extra peace of mind. Even regular motor oils test good for minimal breakdown in the 6000 - 8000 mile range but it's smart money even if you want to stick with the 3 - 5 k range IMO and especially so if you drive the car a bit more aggressively.

Read more here; All About Motor Oil

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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