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Old 03-25-2008, 02:34 AM   #1
ridestreet84
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Default Mobil 1 turbo diesel truck 5w-40

so after reading and searching about this i am still not sure i picked some up but want to make sure it is safe for my car. i havent really seen anybody say anything bad or good about this oil all i have seen are people saying they want to try it soo how is it?
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Old 03-25-2008, 10:34 AM   #2
bzbuzz
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lol you said you searched but havent found anything?
you gotta try little harder next time..

anyways, its good oil as well as shell rotella 5w40..
i am running rotella now..me like it..
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Old 03-25-2008, 10:49 AM   #3
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Diesel oils that meet the latest API CJ-4 spec have less anti-wear additives and detergents than those that don't so it should be safer for cats than the diesel oils of a few years ago. Is there a definitive answer? No, IMO.
http://www.apicj-4.org/faqs.html

-Dennis
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Old 03-25-2008, 10:57 AM   #4
ridestreet84
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thanks not to worried about cats though as i am lacking them
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Old 03-25-2008, 11:00 AM   #5
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Then it's definitely safe for your car.

-Dennis
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Old 03-25-2008, 11:09 AM   #6
ridestreet84
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thanks as this was all i could find yesterday and the car could really use a change
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Old 03-25-2008, 08:54 PM   #7
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Diesel oils that meet the latest API CJ-4 spec have newer, better anti-wear additives and detergents than those that don't so they'll be even better to run in your car than the old-tech ones.

Having said that, I like Rotella T much better.
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Old 03-16-2012, 04:28 PM   #8
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back from dead....

I just got my car back from the dealer oil change (I am busy not lazy ) and notice they've used this oil (Mobil 1 Turbo Diesel Truck) when I requested Subaru brand synth 5w40.

They're correcting this error Monday, and judging from the posts it isn't the end of the world. Anyone have more feedback?

Seems like the only consensus on here about oil is, Mobil 1 sucks
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Old 03-16-2012, 05:37 PM   #9
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TDT is a good oil. The people that say Mobil1 as a brand sucks (based on experiences with the regular 5W-30) are ignorant or lazy or both. TDT should be compared to RT6.

-Dennis
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Old 03-16-2012, 05:44 PM   #10
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Umm, I'm pretty sure there's no such thing as Subaru brand 5w40 at least not in the US.

And the Mobil 1 that "sucks" is the energy conserving 5w30, not the 5w40 Turbo Diesel Truck variety. TDT is excellent oil, leave it in.

If your dealer told you they're putting Subaru brand 5w40 in the car they're either confused, lying or just placating you. Certainly don't let them replace M1 TDT with Subaru brand 5w30, that's a major step backward. Subaru brand 5w30 is not any better than Mobil 1 5w30, both are energy conserving oils which shear quickly to a 20wt.
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Old 03-17-2012, 10:37 PM   #11
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Quote:
Originally Posted by gpshumway View Post
Subaru brand 5w30 is not any better than Mobil 1 5w30, both are energy conserving oils which shear quickly to a 20wt.
Can you provide a link to support that statement. There have been a couple of members here that have posted Blackstone oil test showing the Subaru 5-30 did just fine.

http://forums.nasioc.com/forums/show...ght=blackstone

http://forums.nasioc.com/forums/show...ght=blackstone

http://forums.nasioc.com/forums/show...ght=blackstone

Last one did test 5/20w but that was factory fill / break in oil.
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Old 03-18-2012, 11:42 PM   #12
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so its safe to run a 40w thought it be to thick. then run mobile delvac or Valvoline blue
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Old 03-19-2012, 02:56 PM   #13
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Quote:
Originally Posted by MD04WRX View Post
Can you provide a link to support that statement. There have been a couple of members here that have posted Blackstone oil test showing the Subaru 5-30 did just fine.
Please define "did just fine". Or better yet provide some evidence that the Subaru oil is better than M1. I'm sure I can dig up plenty of UOAs where M1 5w30 "did just fine". Also it should be noted that in the context of current discussions we're talking about the API SN version of M1 5w30 here, meaning UOAs of the SL and SM versions no longer apply. The SN version shows signs of being substantially better.

The three UOAs you quote there are either mediocre or flawed for comparison samples. The first shows a car driven 75% highway which is modded and tuned, and the oil is 9.7 cst after only 4,200 mi. Subaru says you can go 7,500 miles even with lots of city driving. The second sample is after only 3,700 mi, half the recommended change interval, and is just barely a 30wt. As for the third sample, you better hope that factory fill is not the same 5w30 you buy at the dealer, it's 8 cst after only 5,000 miles!

The requirements for an energy conserving (ILSAC) 30wt oil are such that there is little space for a formulator to make one that is substantially better than another in the context of a turbo Subaru. Sure, a highly shear stable group V/IV blend would be able to meet the EC requirements while still maintaining good viscosity, but if the Subaru oil were Group V/IV it would be $10/qt at least. It doesn't even have the giant slug of moly that the 0w20 version has.

I'm not in the "M1 5w30 is crap" camp, it's just as good (or bad) as any other group III energy conserving oil, including the Subaru oil. No EC oil spells instant spun bearing, but Non-EC oil provides a bigger safety margin against it.
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Old 03-19-2012, 09:17 PM   #14
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Quote:
Originally Posted by gpshumway View Post
No EC oil spells instant spun bearing, but Non-EC oil provides a bigger safety margin against it.
Spun main bearing help.

-Dennis
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Old 03-19-2012, 09:20 PM   #15
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I will leave it in, thanks for the advice. I found a bunch of posts from 2008 saying it was ok too.

unsurprisingly the oil topic is still a volatile one...
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Old 03-20-2012, 04:47 PM   #16
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Quote:
Originally Posted by bluesubie View Post
Ouch!

It's really sad that the auto/oil industry markets their products the way they do. The result is many people look for the "best" 5w30 product based on brand, when in fact 5w30 belongs in two different categories. EC and Non-EC.

M1 High Mileage 5w30, Valvoline MaxLife 5w30 (both full syn & blend), and Pennzoil High Mileage 5w30 are all in the same category and are quite different from M1 5w30 (regular or EP), Valvoline Synpower 5w30, and Pennzoil 5w30.

The way industry markets the products though, most people would think that M1 is better for a turbo Subie than Pennzoil High Mileage simply because it's synthetic. Unfortunately the reverse is true as long as you don't extend the OCI too far. The result is tragedies like your link above.

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Old 03-20-2012, 06:00 PM   #17
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Check out these uoa's from a Legacy GT:

http://legacygt.com/forums/showthrea...rt-171286.html

There are several uoa's posted there as you scroll through. The difference in the additive pack between M1 High Mileage 5W-30 and Subaru synthetic is amazing. The M1 HM is the one that remained a 30 weight and has higher zinc, phosphorus, and calcium. The Subaru oil is the one that sheared to a 20 weight and has a weak additive pack.

I really hope the Subaru oil has some beneficial non-metallic additives that don't show up in a uoa. Especially since it should have been reformulated recently for GF5. An engineer that posts at IWSTI claims that he will be doing 7,500 mile intervals with uoa's on the Subaru oil. I've been waiting on the results for a while now.

-Dennis

Last edited by bluesubie; 03-20-2012 at 06:06 PM.
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