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Snotrocket said:
I run the 15-40 in my engine without any problems.
Really....?? and that's because you are one of those guys who are smarter than the engineers who designed the engine and spent countless hours testing them... RIGHT? :sidelaugh: :sidelaugh:

I know.......... I know.

"I hate you, Tom." :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol:
 

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Onan came out with Onamax 15W/40 before the P series engines were produced. I wonder why Onan did this, must have been for use in Briggs & Stratton, Kohler, Kawaski, Wisconsin, Tecumseh, Continental, Lycoming, Chrysler, Ford, Chevy, GMC, anything but Onans!!!!! :sidelaugh: :sidelaugh: :sidelaugh: :sidelaugh:
Anyway Onan engineers are old and umemployed so what do they know and what Onan built in the 60s-70s was designed in the 30Ws!!!!! :sidelaugh: :sidelaugh: :sidelaugh:
Mad Mackie in CT :mrgreen: :mowlawn:
 

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I never did have a BR549 but I had a BR548 and a BR550 and both used 0W/0 olive oil, extra virgin of course!!!! The air filters used a choice selected blend of manila hemp and rabbit turds!!! Exhaust systems were made from bamboo with catalytic converters !!! HARHARDEEHARHAR!!! :sidelaugh: :sidelaugh: :sidelaugh: :sidelaugh:
Mad Mackie in CT :lol: :cool: :lol: :mrgreen:
 

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Hi Mark,
All my 4 strokes are Briggs and use 5W/30 synthetic oil, I love it. The only use that I now have for 15W40 is in the transaxle of my 4018 with 20W50 synthetic in the hydraulic system and the next oil change in the transaxle it will get 20W50 synthetic. Finally getting away from my garage looking like an auto parts store lube dept!!! Looking at a 4016/Onan but if I buy it I will repower it with a Vanguard 18 and sell the Onan.
Mad Mackie in CT :mrgreen: :mowlawn:
 

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I just got home from a 850 mile trip to bring this ragamuffin 448 home so I'm going to be in the market for some new oil from the front to the back of this machine.
Hey Bob how many lbs of compression should this 18 hp Onan be putting out cold I got 110 lbs.out of each cylinder and how noisey are these starters? This ones pretty noisey although the battery was kinda low might have been making the starter more noisey than it actually is, thanks.

Mark
 

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Oil is a very personal decision.

The problem with discussions like this one is that no one can PROVE that they are right. There are more things that affect the lifespan of an engine than oil choice so in the end....you takes yer pick and you'se takes yer chances. If your engine lasts 4000 hours, you can't give the credit to the choice of oil even though it most certainly played a part.

Anyone reading this thread should be told that Bob MacGregor is not your average bear when it comes to these tractors. Bob makes his living out of cutting grass etc and puts his equipment to more use in one week than most of you do in a year. When running a business, keeping things simple is a good thing. Zeroing in on one type of oil to use in your equipment is one way of keeping things simple. Bob is also in a position to write off the higher cost of synthetic oil use through his business. What works for Bob may not necessarily work for some of you. Once again....personal choice.

Without question, synthetic oils do bring certain advantages to the table but for the average user who puts less than 100 hours per year on his equipment, CLEAN oil is always the key. Most of you own tractors with no oil filters anywhere. Only a few of you have Ingersoll's with filtration in the hydraulic system and several more have an Onan with an engine filter. Timely oil changes are important when no filtration is present.
 

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I am running Kohler straight 30 small engine oil in my 446 with 18 Linamar (Onan) this time of year per operators manual. The engine seems to be very pleased with this oil and I am confident (IMHO) that it is the correct formulation/rating for these air cooled engines.
It's just what I do, I am no expert and I am not saying this is what everyone should do. :222: :446: Best Regards, Rich
 

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There was a time when I could buy 30W in 2.5 gallon pails but after a while it was discontinued and 15W40 became available in 2.5 and 5 gallon pails. I found no difference in oil consumption between 30W and 15W40 in Onans but I did notice that when the first cold fall day arrived that with 30W the Onans cranked over slower and would give a short puff of blue smoke when they started.
Most of you don't have 3-4 machines that are operated regularly so having a 2.5 gallon pail of engine oil hanging around gets in the way. It was easier to use 15W40 with older Ingersolls as it was used in the engines, hydraulic systems, and transaxles. Many times I have had to change oil at 10-15 hour intervals due to very dusty operating environments.
As Tom has mentioned oil brands and weights are somewhat personal to many of us and there are several brands that I will not use especially the store brands.
I used Shell Rotella 15W40 and Lucas additives in my my 1978 Peterbilt/425 Cat that I had years ago. It went 1.2 million miles before an out of frame overhaul was performed. I didn't drive this truck much as I had two hired drivers running this rig. I stocked 5 gallon pails of Rotella and 18 gallon drums of gear oil with pumps mounted on them. The last time I drove the big rig, diesel fuel was 88 cents a gallon!!! Then got into Ford F 350s both gas and diesel, they are gone now too, lots of Rotella!!
Anyway, the sun is shining, the grass is drying out from the morning due and this old phart has to get his mowing machines up to temp!!!!!
Seeya
Mad Mackie in CT :mrgreen: :mowlawn:
 

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oleblu72 said:
I run Chevron Delo 400 15/40 in my Mack I was thinking about running that in the 448.

Mark
Hi Mark,
I see no problem using the Chevron in you Onan, I used it for a season when my Rotella distributor went crazy with his prices and was more expensive than Walmart. I had thoughts that it may be a better oil than Rotella in small air cooled engines. Delo or Delvac I don't remember, I may have used both.
Bob MacGregor in CT :mrgreen: :mowlawn:
 
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