THSCC Forums

If you purchase on-line and for store pickup, you get $4/qt discount on Mobil 1. It won't show up until you click on the item, and then it will show the $4/qt discount. When you add it to your cart, the discount will then show up.

This is an incredible deal -- better than any I've seen on oil in a while. It ends today -- 50% off Mobil 1 doesn't come around anywhere I've seen before.

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Current stable:
2019 BMW M2 Competition slicktop 6MT
2011 BMW M3 sedan slicktop 6MT
2007 BMW 328i wagon (slushbox for now)
1975 CanAm 125MX2

I'm trying to decide if this deal is worth jumping ship and giving 0w40 a go in the WRX. It's known to shear pretty quickly to a thick-ish 30 weight, but can it stay a thick-ish 30 weight for 3500 miles with 3-4 autocrosses like GC can .

_________________
2011/2012 Autox VP
2013/2014.5 President
2013 Top Gun

2015 Fit

22R-EC => 4G63 => D16Y7 + D16Y8 => EJ255 + K24Z2 => K20Z3 + K24Z2 => K24Z2 + M54 => L15B

While $4 a quart is a good deal, I have 5 one gallon jugs of Rotella T6 already, so I will pass on this, as I have more than enough to get me through the lifetime I will own the STi Although, I just did start our '10 FX35 on it. - AB

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'14 Toyota Sequoia Platinum 4WD
Super Westerfield Bros - '93 Integra - LeChump Du Jour
STX 93 - Scion FR-S

awesome, thanks chuck!

Thanks Chuck!

Bummer that it's limited to 12 qts... I added 40 quarts to my cart, no luck!

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Mike Whitney
whit32@gmail.com, 919-454-5445
V10, V8, V8t, I6, I6, V6, F4t, I4, I4, I4, I4, I2, 1, 1

Hmmm, I do need to change both cars soon.

2 five quart jugs @ Wallymart = ~$50
10 qts. at Advance = $40 and I don't have to wait in line

Score.

thanks!

that's why i placed orders at two different stores

Some people's wives have been know to buy the second 12 quart order.

_________________
Current stable:
2019 BMW M2 Competition slicktop 6MT
2011 BMW M3 sedan slicktop 6MT
2007 BMW 328i wagon (slushbox for now)
1975 CanAm 125MX2

Have you seen oil analysis reports to support that claim (i.e. multiple reports)? There is a thread on the m5board where UOA are posted, and from the 0W40 users going 6-7k miles on a change, there is no significant viscosity problem noted. 0W40 has wonderful HTHS properties that other Mobil 1 oils are lacking fwiw.

_________________
Current stable:
2019 BMW M2 Competition slicktop 6MT
2011 BMW M3 sedan slicktop 6MT
2007 BMW 328i wagon (slushbox for now)
1975 CanAm 125MX2

I agree about the HTHS, and it's NOACK volatility is pretty low too (as are most ACEA A3 certified oils). However, 0w40 is a 13.4 cSt oil at 100 degC....about the thinnest 40 weight oil on the market. It's also renowned for shearing to a medium thick 30 weight (say 11.5-12.5 cSt). In fact during, the Q&A session with the XOM representatives on BITOG, XOM pulled a real BS response to the question about 0w40 shearing so easily to a 30 weight.

But yes, there are 100s of UOA of m1 0w40 shearing to 30 weights on BITOG. It's a great oil for someone like me who wants a robust and thick 30 weight with low NOACK volatily and high HTHS and ACEA A3 rating (ie not the run of the line energy conserving, almost 20 weight crap). However, for those requiring or wanting a true 40 weight, then it's probably not a great choice.

Granted, it is still a solid oil (the only M1 other than 5w30 ESP that I'd use in ANY car.....note the ESP...not regular 5w30 or Extended performance). 6-7 OCIs in a e39 v8 M5 without permanent shear into the 30 range is unbelieveable. Any UOAs to link?

EDIT: found this:
http://www.m5board.com/vbulletin/e39-m5 ... 0-uoa.html

And sure enough it was 11.6 cSt which is a mid range 30 weight. Let me say that it isn't necessarily a bad thing so long as you are aware of the fact that M1 0w40 shears a lot. However, if you are buying 0w40 because you NEED a 40 weight, then you should find something else.

_________________
2011/2012 Autox VP
2013/2014.5 President
2013 Top Gun

2015 Fit

22R-EC => 4G63 => D16Y7 + D16Y8 => EJ255 + K24Z2 => K20Z3 + K24Z2 => K24Z2 + M54 => L15B

Nevermind, I just looked at one in particular and noted that it was 11.6 cSt after 6900 miles: http://www.m5board.com/vbulletin/attachments/e39-m5-e52-z8-discussion/96867d1263748387-mobil1-0w40-uoa-m5-uoa.pdf

I was thinking in general about the viscosity not being mentioned as an issue in the UOA reports that I have seen.

I've been using BMW 5W30 synthetic (GC) in the M5 since it was new, and it always comes in on the high side for a 5W30 where they always comment about it being more like a 40W at 100C. I've only used M1 0W40 in the other cars so far, but I've not run a UOA on any of them.

_________________
Current stable:
2019 BMW M2 Competition slicktop 6MT
2011 BMW M3 sedan slicktop 6MT
2007 BMW 328i wagon (slushbox for now)
1975 CanAm 125MX2

Yep BMWs 5w30 is good stuff....you must have one of the later e39 M5 that actually 'allow' you to use the 5w30.....the earlier ones 'require' you to run TWS 10w60 which is insane given there was no engine changes if I'm not mistaken.

EDIT: I had it flipped.

_________________
2011/2012 Autox VP
2013/2014.5 President
2013 Top Gun

2015 Fit

22R-EC => 4G63 => D16Y7 + D16Y8 => EJ255 + K24Z2 => K20Z3 + K24Z2 => K24Z2 + M54 => L15B

It's the other way around. The early E39 M5s were specified to use BMW Castrol TWS 10W60, and then from Mar 2000 production and forward they specified BMW 5W30 synthetic. There has been HUGE discussion about this issue with M5s and Z8s over the years.

It gets crazier since some claim the reason for the change was that BMW was paying full maintenance, but that was only for cars in the USA, so it really didn't make sense. The other thing that happened in Mar 2000 was that the S62 received a different design piston ring(s) as of March production. Hence, people have guessed that the switch was made because of that reason which really doesn't make much sense since one would think the main reason you want the 10W60 is for high temp viscosity needs (i.e. rod bearings especially) that didn't change.

Over the years, people have quoted an S62 design engineer saying that you should never use anything but BMW/Castrol 10W60 in the engine while BMW's "official" word was that BMW/GC 5W30 was fine.

The net of it is after all these years, there has been no significant engine issues that have come to light where either oil was suspected. One of the most fastidious car owners I have ever met in my life who now has ~250,000 on his 2000 M5 (bought new in Oct 99) used TWS from new, changed it every 3-4k miles and spun a rod bearing at 95k miles.

Probably more than you wanted to know, but this is still an "issue" with me as I've been thinking of switching to TWS (actually have a case in the garage) now at 57k miles...

_________________
Current stable:
2019 BMW M2 Competition slicktop 6MT
2011 BMW M3 sedan slicktop 6MT
2007 BMW 328i wagon (slushbox for now)
1975 CanAm 125MX2

No, that's good info, thanks.

Anyway, I'm sticking with GC (after all this talk ).

_________________
2011/2012 Autox VP
2013/2014.5 President
2013 Top Gun

2015 Fit

22R-EC => 4G63 => D16Y7 + D16Y8 => EJ255 + K24Z2 => K20Z3 + K24Z2 => K24Z2 + M54 => L15B

Has anyone ever studied in-depth lubrication/tribology? I picked up a tribology text book a couple of years ago and taught myself a bit more about the subject (I know, 51-year old nerd).

One of the things I found interesting was the discussion of the non-Newtonian characteristic of a multi-weight oil that is a function of shear rate. At high rates of shear, the viscosity drops off significantly (due to the polymer viscosity improvers aligning their structure in the direction of the shear). When the shear rate falls (i.e. oil tested), it is back to its specified viscosity. Therefore every trip through a rod bearing is potentially susceptible to this viscosity fall-off (if the shear rates are high enough). Hence the oil behaves in a high non-Newtonian fashion while a straight weight oil is pretty much a Newtonian fluid (linear relationship of Kinematic viscosity vs shear rate).

However, what I haven't found is more up to date information. The example chart in the book (Engineering Tribology, 3rd ed) shows a comparison between SAE 30 and SAE 20W/50 oils, and I'm guessing that it is from a long time back. I'm curious what a chart like that looks like for a modern ultra-high quality synthetic oil (i.e. BMW/GC 5W30 or 10W60), but I've searched the net to no avail so far. I assume these modern oils still exhibit similar behavior but perhaps not as dramatic as earlier dino oil designs?

_________________
Current stable:
2019 BMW M2 Competition slicktop 6MT
2011 BMW M3 sedan slicktop 6MT
2007 BMW 328i wagon (slushbox for now)
1975 CanAm 125MX2