66.00 bucks for three jugs-plus tax. i get amsoil delivered to my door for 3.00 bucks cheaper!

 

When you can get oil cheaper DELIVERED, that is

 

The fact is that Cummins motors do not come from the factory with synthetic oil, they come with dino oil. TDR Magazine has done oil comparisons in their last two issues. Read the results and decide for yourself.
Cheers
Mike
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The fact is that Cummins motors do not come from the factory with synthetic oil, they come with dino oil. TDR Magazine has done oil comparisons in their last two issues. Read the results and decide for yourself.
Cheers
Mike
###

 

What's the deal here about 15w/40 not working well in the winter months?

I run 15/40 Synthetic Amsoil in my truck all year round. When it's -20* below I have no issues at all sliding my key in and waiting for the glow plug light to turn off then cranking up my truck. The crank time realy isn't any longer then it is when it's hot outside.

Is running 15/40 in the extreme cold realy that bad?

 

I live in Edmonton where it probably gets just as cold as you...probably a little
colder (not much, I know Winnipeg is close by in your neck of the woods and they have everyone beat...), but I know lots of folks who run regular 15W40 in the winter and never have any problems. My biggest worry with regular oil and extreme cold is spinning a bearing, not my idea of a good time. I think Synthetic 15W40 in the coldest months without plugging in will probably not cause any more wear than any other oil. Just drive sensibly until you get a bit of run time first start of the day... we all do this anyways, right?

Also, in addition to fully synthetic 15W40's, also check out some of the semi synthetic 15W40's out there- some have just as good of cold cranking numbers as the full synthetic 15W40's. 76 Royal Triton is one, Petro Canada is another. Most of these can be had at a cheaper price, too. Most of them have really good specs.

 

Was running LUCAS 5W20 for 20,000 (2 oil changes) switched back to rotella 5W40

Lucas =$32.00 gal+-
Rotella= $22.00 gal +-

 

Do I read this right that you were running 5W20? In your Cummins?

 

I know there are A LOT of different opinions out there. In the end, I don't understand someone stating that they base their decision on saving $20.00 - $30.00 every 5,000+ miles. This money can be spent in 10 minutes at a bar, or getting food at the movies, or going out to eat at a low-priced restaurant. The point is, you have a $6,000 engine and a $30K truck, like the saying goes:

"Step on a dollar to pick-up a penny."

Anyway, I didn't want this to get into an oil thread war. Facts are facts, synthetics out-perform conventional oils. No questions. Now, whether our trucks can benefit from it, that can be debated, as they are built tough and can run on either. Where I do believe 100% that they benefit from synthetics is in the winter.

Do a test. Get a quart of conventional 15W-40 and a quart of 5W-40 synthetic. Place both of them in the freezer. Now, pour each one out and see for yourself.

Now, before someone states that the synthetic is only a 5 weight cold and the conventional is 15 weight, THAT IS POINT!!! Synthetics can run great variances between their cold and hot weights due to their structure. A conventional CANNOT. Even if both were 5 weights, the synthetic would still flow better.

 

Use your $22 a gallon oil if it makes you feel better brother. Mobil thanks you for every dollar you give 'em! The good folks here, some with vast diesel engine experience are just trying to save you some money. It never gets cold enough in Arizona to need synthetics. Or the rest of the desert southwest for that matter! Even the guy in Edmonton runs 15W-40 in the winter.
God bless!
Mike
###

 

One advantage of the 5w40 that no one has mentioned is that when the engine is started cold it's going to circulate and lube the engine quicker then the 15w40. I forgot what the percentage is, but I think it's somewhere around 90%. Most engine wear occurs @ start-up. Another thing with the synthetic is that it bonds to the metals in the engine when it's circulates.

 

Pssst, your Cummins does not have glow plugs It is called a grid heater

 

$30 every 5K miles is alot of money, ESPECIALLY when you are just throwing it away. I have NEVER had a motor related problem, and I have never run synthetic. My goal on this rig is 500K miles, and of course on dino. When I get there in the year 2017, I will say hi. Which by then, I will have saved $3150. Now tell me you would just throw that much money away.


And the part about that money being spent at the movies is EXACTLY why I need to save teh $30 on an oil change, so I CAN spend $30 at the movies

 

D-Roc, im not real close to Winepeg. Im actually pretty far from the border of Canada but it still gets -20 below here, it's plenty cold for me & vehicles.

SSminnow- My truck does have the glo plugs, I converted it over. lol j/p. I thought for the longest time that the squigley line on the center cluster was a symbol for the plugs. hmm.

The grid heater dosen't happen to sit under the airhorn does it?

 

Very funny No worries, I think I thought that too or, maybe not