15-40 oil

I have heard of people running 15-40 oil whether it's shell rotello or John Deere or others in every thing they own even cars that call for 5w20 what do you think of this

Well I sort of do that ? Run it in my tractors, lawn mower and truck. My little car I use the 5w20 as called for as it gets ran in the winter and it can get pretty cold sitting out at work all day.

I do it too and think little to nothing of synthetic oils while I do this. I see no reason to waste money, but I AM going to use a good oil and change it when needed.

I run JD 15-40 in all my diesel tractors year around.

Ask about the API rating . Everybody runs around concerned about viscosity but complete miss the boat on something more important .
Viscosity depends on bearing clearance .

Buickanddeere tell me more that is my concern if
Honda recommends 5w20 I'm concerned about
using 15w40 in it no matter how good of oil it is

You can get oiling issues on some of the newer cars with running oil thicker than recommended, stay with what is recommended on your vehicles.

(quoted from post at 11:25:58 04/20/16) Buickanddeere tell me more that is my concern if
Honda recommends 5w20 I'm concerned about
using 15w40 in it no matter how good of oil it is

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Can't build an oil wedge for the journal to "surf" on. If the viscosity does not match the clearance .

Good analogy

There is really no need to follow any manufacturer's directions if you can do as Red Green does when something breaks down: Scowl at it with your hands on your hips, then point at it and say "Well that's a bad design!".

Thanks

I've got a new Holland skid loader that takes 10w30. Problem is I can't find any with the specs the owners manual says it takes. A couple local oil distributors went through there books and couldn't find anything either. I ended up driving 30 miles to a new Holland dealer to find the 30w they had didn't have any specs even listed on the 2 1/2 gallon jug. I bought it, but probably should have just put the 15-40 I have in the shop in it.

In my cars, I run synthetic oils (5W-30) meeting the specifications of the manufacturer. I believe the synthetic handles temperature extremes better than conventional oils, and I also feel I have a bit more of a "cushion" in driving a bit past in the oil change interval. The female drivers in my household pay little attention to the oil change sticker I put in their car when I service a vehicle. All vehicles DO have a "oil change" monitor, but I do install the stickers with "next service due" mileage written on them. I shoot for 5000 miles, which is probably overkill, but I have had a couple car we ran to just beyond 300k miles and not a one burned oil! My Chevrolet diesel truck, I use 5W-40 synthetic year-a-round. I do not drive it much in the winter, but if I need to, at least the oil will pump easier when it is sub-zero. In my diesel tractors I run 15W-40, except for one. My yard and snow removal tractor I run 5W-40 synthetic year-a-round. I plug it in before moving snow and it seems to crank easier. I only have one tractor that is new enough to spec out 15W-40 oil, with the rest dating back to specifying 30W engine oil. My gas powered tractors get used some in the winter and do not get used for heavy work anymore. I use 10W-30 in them. I would never go back to straight weight oil in my tractors. What I have been doing, right or wrong, has worked for me and I am not inclined to change.

I use delvac 15/40 in everything of course the newest thing I have is an 88 dodge pu.

Back when I was a kid and motors rattled, clanked and blew smoke I would do that. But no way in the modern motors. Not even in my pick up truck. I go with the mfg recommendations and that thin stuff works fine.

However I am not necessarily a full synthetic guy but that has to do most with economics, I think it is good stuff also.

Currently our Toyo gets serviced at the stealer every 10K miles to keep up the lifetime power train warranty. that is full syn.