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#4724057 - 04/11/18 08:23 PM Marine engine oil vs automotive and diesel oil
Jack2468 Offline


Registered: 12/05/17
Posts: 10
Loc: SC
I was wondering if regular automotive engine oil, or diesel/heavy duty engine oil would work in a marine application.

The engine in question is a Suzuki DF140. The Suzuki oil is really expensive (like $9/quart for the old stuff and about $10 or $11 a quart for the new Ecstar stuff local to me), which seems expensive, especially for a 10W-40 synthetic blend. Not only is it expensive, the Suzuki dealer is pretty far from where I am located and inconvenient unless I need anything major done.

Would a quality SN rated automotive oil be ok to use? Preferably Mobil1 or Pennzoil Platinum or similar since Walmart sells them by the 5 quarts reasonably cheap and they are a quality full synthetic that perform very well in automotive applications.

Otherwise, would a diesel/HDEO like Rotella be better? I think they are designed to stand up in tougher/hotter conditions.

The last option is to just stick with OEM stuff, which is expensive and hard to find, but I'll use it if it truly is just the better option to stick with OEM marine oil in this application. If this is the best option, where can I find the Ecstar oil to order online for a fair price?

These suzuki engines appear to bee very similar to an automotive design, and are water cooled 4 cycle engines, just as cars are, so I would assume regular, quality automotive oil would be fine to use, am I correct or not?

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#4724061 - 04/11/18 08:28 PM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
simple_gifts Offline


Registered: 07/26/04
Posts: 11868
Loc: Middlesex County CT
So you might want to read up on Amsoil's WCT 10w-30 and WCF 10w-40

https://www.amsoil.com/shop/by-product/m...oke-marine-oil/
https://www.amsoil.com/lit/databulletins/g2133.pdf

Not suggesting it as an option, but it does highlight some of the differences they formulate for.

storage considerations,
shear from high rpm etc.


Edited by simple_gifts (04/11/18 08:31 PM)
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#4724067 - 04/11/18 08:32 PM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
Linctex Offline


Registered: 12/31/16
Posts: 5714
Loc: Waco, TX
Originally Posted By: Jack2468

...which seems expensive, especially for a 10W-40 synthetic blend.

Otherwise, would a diesel/HDEO like Rotella be better? I think they are designed to stand up in tougher/hotter conditions.


I think Delo synthetic 5W-40 or Rotella synthetic 5W-40 would work just fine in that engine!
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#4724071 - 04/11/18 08:36 PM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
4WD Offline


Registered: 09/21/10
Posts: 6027
Loc: Texas/International
FC*W has to be tested for anti foam … some “road oils” are tested similar …

I have read (mechanics on boat blogs) that’s one thing to watch on a Suzuki … (signs of foaming) …
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#4724095 - 04/11/18 09:03 PM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
benjy Offline


Registered: 08/23/10
Posts: 744
Loc: pa
typical manufacturer overpriced oil!!! i would not hesitate to use a "synthetic" car or truck oil + a 15-40 diesel would prolly do well!! i believe walmart sells some marine oils for cheap depending on the store location + theres always .com mail order!!

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#4724098 - 04/11/18 09:06 PM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
Imp4 Offline


Registered: 04/06/18
Posts: 49
Loc: Somewhere in time
Here's what Suzuki says:
Quote:
The actual oil recommendation is: SAE or NMMA FC-W 10W-40 (operating in temps from 14 degrees to over 100 degrees F) or 10W-30 (operating in temps from -4 degrees to 86 degrees F) API or NMMA FC-W Classification SE,SF,SG,SJ. For temps below -15 degrees F use SAE or NMMA FC-W 5W-30.


The easiest thing to do is follow their recommendation and worry about other things of actual consequence.

Also, you own a boat.

So you don't really get to complain about maintenance fluid availability or cost.
Come on man, it's a hole on the water that you throw money into.

And you know this.


Edited by Imp4 (04/11/18 09:07 PM)
Edit Reason: Arrgh spelling

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#4724111 - 04/11/18 09:20 PM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
4WD Offline


Registered: 09/21/10
Posts: 6027
Loc: Texas/International
Walmart.com had Quicksilver 25w40 for $26 a jug … but getting low last time I looked …

That’s practically an FC*W mono … Merc being anti VM in formula …
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#4724192 - 04/11/18 10:51 PM Re: Marine engine oil vs automotive and diesel oil [Re: 4WD]
Linctex Offline


Registered: 12/31/16
Posts: 5714
Loc: Waco, TX
Originally Posted By: 4WD
Walmart.com had Quicksilver 25w40 for $26 a jug … but getting low last time I looked …


In the clearance section for $17 a jug when i last looked.
_________________________
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4724226 - 04/11/18 11:26 PM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
bubbatime Online   shocked


Registered: 03/18/08
Posts: 5456
Loc: South Florida
Diesel oil will be superior to car oil. You will find a LOT of guys are using Rotella 15W40 or similar heavy duty engine oils in their 4 stroke marine engines.

Check your Wal-Mart. They clearanced out Quicksilver and Evinrude 25W40 marine oil. That would be a good buy if your store still has any.
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#4724314 - 04/12/18 06:05 AM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
Kamele0N Offline


Registered: 02/09/15
Posts: 1945
Loc: Slovenia
http://www.ybw.com/forums/archive/index.php/t-122220.html

Quote:
28-04-07, 10:37
Marine Diesels and other special considerations.
Inland Marine Diesels (and certain road vehicles under special conditions) can, and do, glaze their bores due the low cylinder wall temperature causing the oil (and more importantly the additive pack) to undergo a chemical change to a varnish-like substance. The low temperature is caused by operating under light load for long periods.
This is related to engine design, some engines being nearly immune to it and others susceptible. The old Sherpa van diesel engines were notorious for this problem. The "cure" such as it is, is to use a low API specification oil, such as CC. Certain engine manufacturers/marinisers are now marketing the API CC oil for this purpose under their own name (and at a premium). You'll find some modern engines where its' industrial/vehicle manual states API CF and the marinised manual states API CC/CD. {Thanks to Tony Brooks for this information.}


HDEO 15w40...25w40...20w50...

Just something that is not api SN...


Edited by Kamele0N (04/12/18 06:14 AM)
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#4724463 - 04/12/18 08:46 AM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11850
Loc: N.H, U.S.A.
ILSAC med/low HTHS oil are marginal under high load high rpm.

You may be safe with a 10-40 or 25w40 THAT IS ALSO acea a3 b4.

PLUS YOU JUST NEED A GOOD OIL. NOT ALL OILS ARE GOOD REGARDLESS OF THE API LABELING
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#4724468 - 04/12/18 08:52 AM Re: Marine engine oil vs automotive and diesel oil [Re: Kamele0N]
krismoriah72 Offline


Registered: 02/16/09
Posts: 1461
Loc: wv

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#4724601 - 04/12/18 11:04 AM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
njohnson Offline


Registered: 05/30/07
Posts: 569
Loc: Indiana
On the back of the Delvac 1 ESP 5W-40 bottles at Rural King, it mentions how it can be used in marine applications. So, Mobil believes it can be used in marine engines.

Look here:

https://www.exxonmobil.com/en/marine/products/categories/list/mobil-delvac-1-marine-diesel-oil

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#4725361 - 04/13/18 06:07 AM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
claluja Offline


Registered: 02/05/16
Posts: 241
Loc: MD
The following was posted by a well respected member on here. I'd stick with FC-W approved oil:


"Look at the philosophy of Honda, who use the same basic engine for their cars and their outboards.

Car might well be specced for 0W20/5W20, but their outboards using the same basic engines call for a 10W30 that meets FC-W.

That spec calls for a post shear HTHS of 3.3

FC-W specs

So Honda are acknowledging that for the duty cycle of the same architecture in a boat, they want something more robust...

So I'd be reticent to run an ILSAC 5W30 in it (2.9-3.1 HTHS BEFORE use)...you could run 5W30/0W30 A3/B4, but they are
pricey here."


Edited by claluja (04/13/18 06:13 AM)
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#4726400 - 04/14/18 03:22 AM Re: Marine engine oil vs automotive and diesel oil [Re: Jack2468]
Kamele0N Offline


Registered: 02/09/15
Posts: 1945
Loc: Slovenia
A3/B4...in sae30...I think that doesnt exist!

Hence...A3/B4 is for severe operating conditions/long drain...

Sae30 over here is reserved for ECO/Bio smile fuel efficient oils (like your sae20 CAFE)

https://www.oilspecifications.org/acea.php
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2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

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