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Old 03-22-2007, 09:29 AM   #1
Dubhlachan
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Question Diesel Oil -vs- Gas Oil ?

What's the difference? I understand the diesel oil is made for the higher temperatures and generally dirtier conditions inside a diesel engine. Can the diesel oil be used in a gasoline engine for 500 miles or so to clean up deposits? Could a gas engine actually lose compression due to being "too clean" ? What do you folks think?

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Old 03-22-2007, 01:10 PM   #2
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Default Re: Diesel Oil -vs- Gas Oil ?

Quote:
Originally Posted by Dubhlachan View Post
What's the difference? I understand the diesel oil is made for the higher temperatures and generally dirtier conditions inside a diesel engine. Can the diesel oil be used in a gasoline engine for 500 miles or so to clean up deposits? Could a gas engine actually lose compression due to being "too clean" ? What do you folks think?
Diesel oil will work fine in your car. it has some extra additives but that's about it. It will not clean out your engine.
Diesel oil is designed to hold deposits/soot suspended in it to prevent the soot from settling and clogging things up.

I've been running Delo 400 in all my gassers for years.

No such thing as a "Too clean" engine.


dan

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Old 03-22-2007, 01:17 PM   #3
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Default Re: Diesel Oil -vs- Gas Oil ?

I used to run delo 400 in my old probe, simply because I could swipe it for free from the place I Was working at at the time. I never had any problems with it. I think it was 15w40.

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Old 03-22-2007, 05:58 PM   #4
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Default Re: Diesel Oil -vs- Gas Oil ?

If you look at most diesel oil it has an SL rating for gas engines too. I just bought some Valvoline Premium Blue Extreme 5W40, I'm going to use it for the summer. Like the other poster stated Diesel oil can keep the soot suspended better than gas engine oil. I probably is a bit better to bring deposits to the oil filter but I don't think it will clean the engine. Auto-rx is a good engine cleaner, recommended at bobistheoilguy.com.

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Old 03-22-2007, 07:23 PM   #5
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Default Re: Diesel Oil -vs- Gas Oil ?

It does have a higher detergent base because diesels tend to be a lot dirtier in crankcase area and the oil has to have the ability to combat this.

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Old 03-22-2007, 09:56 PM   #6
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Default Re: Diesel Oil -vs- Gas Oil ?

I used Rotella T 5w40 for several oil changes in my S. I gave it a shot based on it being a quality synthetic with HDEO robust properties, something I felt I needed to free up the oil control rings, control consumption, and maybe have a cleaner engine. Without having an oil analysis done at every change, i didn't really know what was going on.

I started trying Havoline 5w-30 based on Bobistheoilguy, and also had what seemed like great results, 1/2-1 qt used between changes. But, SM-rated oils have come out, and it seems no matter what I use, my Saturn has been using it at that rate. I like Havoline on a price/performance scale.

Since I am a professional pilot flying piston engine aircraft, seeing how they use oil, and how long they last before an overhaul, I feel it is far more important to have motor oil at the proper level in the crankcase than weight, brand, or any other factor. Whatever you decide to use, just make sure to "CHECK YOUR DAMN OIL!"

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Old 03-22-2007, 10:23 PM   #7
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Default Re: Diesel Oil -vs- Gas Oil ?

check this out http://en.wikipedia.org/wiki/Motor_oil they mention the Saturn S-Series

Quote:
The 3000 Mile Fact
There are still vehicles that need 3K oil changes, but it's not because the oil goes bad after 3K miles. One example is the Saturn S series. These vehicles have a timing chain system that is very sensitive to clean oil because oil pressure is used as hydraulic fluid to ratchet up the timing chain tensioner. If varnish forms in the timing chain tensioner bore then this system can fail and the chain will become loose and eventually break. Dealers have gone as far as tearing out the normal service schedule (6000 miles) and leaving only the severe service schedule. If an engine is destroyed by a failed timing chain while under warranty, then the dealer will legitimately request evidence of oil changes from the owner.

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Old 03-26-2007, 11:29 AM   #8
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Checkered Flag Re: Diesel Oil -vs- Gas Oil ?

Thanks for all the replies. I'd suspected what seems to be the general consensus, that it's not that much different than regular motor oil.

Interesting about the timing chain tensioner, I hadn't thought about that.

I've read an article about various manufacturers going to a higher service interval because "today's oils are more robust and car engines are designed better" but after reading that blurb from Wiki I think I'll stick to my regular schedule.

Thanks all.

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