10W30 Diesel Oil Recommendations?

[oldballs]

I did something like that on a 10 HP gasoline engine. I had just done an oil change using 5W-30 full synthetic. Fired up the engine and turned away for a couple minutes before noticing some smoke coming out from the engine. I shut it off right away and figured the engine must be ruined. Now, several years later, the engine runs just as well as it ever did.............I had not replaced the oil inlet plug at the base of the engine.. :ashamed:

Cheers,
Mike

 

[Bearsixty7]

Good advice except your forgetting that synthetic oils bond to metal better and don't flow off like conventional oil. I discovered this entirely by accident. I am the 2nd owner of a Ford 2000 Diesel tractor I use synthetic oil in andabout 12 years ago I had just changed the oil and my neigbor came over to ask a question which i answered then went to work out in one of my pastures brush hogging. I noticed the oil light come on but paid little attention because i had just changed it but it bothered me after a half hour or so hoggin I disengaged the pto and drove the 1/3 mile back to my shop to see what was wrong with the oil light. This old tractor dosen't have the best gauges and i don't trust them. Well the first thing i do is look at the dip stick and much to my surprise it was dry. Then i noticed there was no drain plug in the bottom of the pan. At that point I knew what happened, the last thing i do after screwing in the plug by hand is tighten it with a wrench and because of my neighbor i missed that step so the plug must have fallen out on the bumpy road over to the pasture. I must have hogged a couple of acres and driven at lest a mile or two with NO oil in the engine. Well I figured i had just killed my old tractor but put a new plug in her filled the crancase up with amzoil marine oil and fired her up. She ran perfect no smoke and 12 years or more later still runs perfect and this ole tractor gets about 100 hours of use hoggin each year. The only way i can explain away the no damage is that the syn oil really does bond with the metal protecting and lubricating even without being renewed. Thats me on the old tractor in the pix the Colonel took in 2016.

I have read about similar circumstances where Amsoil was used and the vehicles continued to serve well for many more years. Just more reasons I think Amsoil is the best and worth the little extra cost.

 

[RalphVa]

That's the problem, at least in my manual (Kioti CK2610, 2020) it does not list the other lower cold viscosity oils as acceptable substitutes. Options are 10W30, 10W40 or 15W40. Full stop.

The other thing to remember is their is a limit to the "magic" of multi-viscosity oil. As a rule of thumb, the largest the gap between cold and hot viscosity, the higher the compromise. It can show up with things like higher volatility/burn rate, and higher degradation over time of the viscosity improvers needed to give the base oil it's "multi-grade" status.

VI improvers are not needed in synthetic oil. There is no wax in synthetic oil either. I have switched very high mileage engines to synthetic with no increase in burn rates. Synthetics are higher boiling than dino oils.

0w30 and 5w30 are a better than 10w30, and 0w40 and 5w40 and 10w40 are all better than 15w40. 10w30 and 15w40 are very old diesel oil grades that would be recommended by engineers who know little about oils.

Ralph

 

[RalphVa]

Yeah, I proved this in our old 1983 240D Benz. Switched it to synthetic, and its fuel mileage went up.

I dug up my old engineering calcs that I did on oils and did this comparison of cold cranking speeds.

Grade cP @ 0 F cP @ 10 F cP @ -20 F Rel. @ -20 Rel. @ 0 Rel. @ 10
15w40 6883 3787 27138 1.0 2.0 2.7
10w40 3311 2002 10399 1.6 2.9 3.7
10w30 2649 1561 8896 1.7 3.2 4.2
0w30 1865 1162 5482 2.2 3.8 4.8

Ralph

 

[mangler]

VI improvers are not needed in synthetic oil. There is no wax in synthetic oil either. I have switched very high mileage engines to synthetic with no increase in burn rates. Synthetics are higher boiling than dino oils.

0w30 and 5w30 are a better than 10w30, and 0w40 and 5w40 and 10w40 are all better than 15w40. 10w30 and 15w40 are very old diesel oil grades that would be recommended by engineers who know little about oils.

Ralph

Less and better VI improvers in synthetics. They still need them for multi-grade oils, more so for large viscosity ranges. There is no magic base stock oil.

Saying 0W30 and 5W30 are better than 10W30 is way too generic a statement. Better at what? Cold starts and top end lubrication time in cold weather, absolutely. But there are other things to consider too, like durability, and stability over time.

 

[RalphVa]

The really wide vis ranges like 0w40 probably have a tad of VI improver, as its VI is 185 (M1), but natural VI of M1 synthetic is about 140. That's enough to cover the 5w30 range and probably 0w30.

No wax either, but wax is a good lubricant as long as it does not freeze.

Diesel oils will have a fair bit of additive to keep the blow by soot dissolved.

 

[bfloyd4445]

Blends are a waste of money because you take on all the disadvantages of conventional oil so whats the point? You loose the superior lubrication at high temp with syn because of the conventioal component which dilutes it and holds true for the other advantages of sny when used in a blend. Not to mention the sludge formation of conventional oil

 

[Frankenkubota]

I picked up oil and filter for my 200 hour oil change from the dealer yesterday. 2 gals oil, 1 filter, $55.

I rag him every time about how much their kabota branded products cost. He's a good guy and smiles and reminds me the warranty requires using kabota products, according to him.

Am i going to gamble a $50 K tractor on a $10-$20 savings.

Service parts can be a high profit margin business for manufacturers and dealers.

 

[bfloyd4445]

I like the Ams marine version. Marine engines are always under load and may run for weeks non stop.

 

[mangler]

I like the Ams marine version. Marine engines are always under load and may run for weeks non stop.

Excellent for older engines. Although in 15W40 I thought their new signature max duty had a slight edge. YMMV.