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View Full Version : AMSOIL 15W 40 synthetic?


mbpd312
10-11-2009, 11:19 PM
Anyone have any comments on this product? I know everyone has an opinion on oil here. I have heard people say they use MOBIL 1, I would use that but I also hear so much about the importance of using the 15W 40. What Mobil 1 are using? Is anyone using this Amsoil 15W 40?

Chicago190
10-11-2009, 11:32 PM
Mobil 1 makes a diesel 5w40 they recommend for 15w40 diesel applications. Amsoil is good quality oil.

TMCNo1
10-11-2009, 11:36 PM
Anyone have any comments on this product? I know everyone has an opinion on oil here. I have heard people say they use MOBIL 1, I would use that but I also hear so much about the impotance of using the 15W 40. What Mobil 1 are using? Is anyone using this Amsoil 15W 40?

I hope you mean importance, cause I wouldn't won't a engine that wouldn't perform sexually.

mbpd312
10-12-2009, 08:34 AM
HHHAAAAAAA.... Thats why your the man, you miss NOTHING.. I do mean IMPORTANCE

TX.X-30 fan
10-12-2009, 11:06 AM
bigmac uses Amsoil in his yard tractor and swears it runs like a top.

bigmac
10-12-2009, 11:25 AM
bigmac uses Amsoil in his yard tractor and swears it runs like a top.

MIGHT be Amsoil. Might also be Mobil 1. I'm not a NASCAR fan, so I really am pretty clueless as to what brand I'm supposed to be buying.

johny123
10-15-2009, 10:58 AM
i've used it, ran great, have since switched to royal purple

deereman
10-15-2009, 07:21 PM
use amsoil in the boat, trucks, and a 33h.p john deere utility tractor--really a good quality oil

Eagle Lake Rebel
10-15-2009, 07:36 PM
Recently switched to Royal Purple 15w40

EricB
10-15-2009, 08:49 PM
It's all good stuff, however the question is why do you want to use it? You will not really gain anything from it with the exception of a thinner wallet. Petroleum based oils are equally as good as long as the scheduled maintenece is adheared to. The oil change intervals will not change because of synthetic so really you're out extra money.
So what is it you really are after?

Craig
10-15-2009, 09:33 PM
I think synthetics are supposed to extend the oil change intervals. They do not break down as fast as dino oils.

mbpd312
10-15-2009, 11:16 PM
Ive read here that some people are changing their oil every 25 hrs. I was hoping to get a whole season from the synthetics(50-70hrs). I certainly dont think thats asking too much. How long are you guys going that are using the petroleum products?

Finnsdad
10-15-2009, 11:34 PM
50hr change with rotella for me.

EricB
10-15-2009, 11:36 PM
What does your Owners Manual say? Mine says every 50 hrs, and use 20W-50 wt. oil that meets/exceeds GM specs (LT1). So that's what I do.
The point is that the engine suppliers go through alot of testing of engines. They will put them through paces you would never think of doing to your own engine (car, tractor, boat, whatever). They DO know what they are doing, and altering their recommendations generally does not lead to beneficial outcomes.
So, I would recommend (as so does your Ops Manual) that you do what is recommended. Changing to synthetics will not increase your change intervals. The engine suppliers will tell you this too. And if you do decide to use something else and extend your intervals, better get a written statement and warranty from the oil supplier backing up their claims.

By the way, the only time we get anywhere close to abusing something is when we rent it...

RMUDBUGS
10-16-2009, 12:53 AM
My Inmar book says every year or 100 hours and use a marine grade 15W40. The only marine grade oil wal-mart had was Quicksilver 10W30 and 25W40. Do you guys use automotive 15W40 or marine grade oil? What do you get and where do you get it? Thanks, this is my 1st boat and I just got it this summer. I will be doing the maintance my self so I'm sure to have a lot of questions.

Kingsley X-1
10-16-2009, 01:42 AM
put down another vote for shell rotella 15-40. i use it in my truck engine, boat engine, and boat v-drive. i have had several diesel trucks with absolutely no engine problems. so my thinking is "if it aint broke, dont try and fix it"

bigmac
10-16-2009, 07:10 AM
My Inmar book says every year or 100 hours and use a marine grade 15W40. The only marine grade oil wal-mart had was Quicksilver 10W30 and 25W40. Do you guys use automotive 15W40 or marine grade oil? What do you get and where do you get it? Thanks, this is my 1st boat and I just got it this summer. I will be doing the maintance my self so I'm sure to have a lot of questions.

The label "marine grade" is just marketing. Go by the API classification. If it meets API spec CI-4/SJ, it's the same oil. Pennzoil's 15W40 "diesel" oil is the same as their "marine grade".

johny123
10-16-2009, 11:36 AM
fyi anyone interested in synthetic, royal purple is almost as cheap as dino

walmart in my parts of canada didn't have synthetic 15w40 but the royal purple was easy to come by at benson's auto

Miss Rita
10-16-2009, 12:37 PM
WalMart has Rotella 15W-40 for $11/gallon and $3/qt. The local auto parts shop had it on sale for $10/gal. I bought three.:D

CottagerGreg
10-21-2009, 11:17 AM
Amsoil's Marine oil is also a diesel oil also....

Price looks to be $7.90 a quart online.. so not too bad.

I am going to be changing over this winterization and see the difference it makes next year. I am sure it be minimal but long run I will be happy as I normally go 100 hours (one season) between oil changes.

Never even had to top off the oil!

bigmac
10-21-2009, 11:35 AM
The ability of synthetic oils to have their advertised "extended drain intervals" relates to shear stability. They have no better detergent ability than any other oil.

Indmar apparently has no problem with using synthetic oil after the engine is good and broken in, but going beyond their recommendations for 50 hour drain intervals is not supported, and dealing with sludge, carbon, soot, blowby etc is the reason. Bad idea, IMHO.

TX.X-30 fan
10-24-2009, 11:10 AM
What about the lawn tractor, do you exceed recommended intervals??

bigmac
10-24-2009, 12:02 PM
What about the lawn tractor, do you exceed recommended intervals??


Nope. In fact, my goal is to get the oil changed and put the snowblower on it today. Also time to winterize the ZTR mower, but it will likely get standard 10W30.

Anyway, the only reason I use synthetic in the lawn tractor is because I put a snowblower on it in the winter and synthetic allows for better cold-weather cranking, IMHO.

WilliM1940
10-24-2009, 11:12 PM
Synthetic allows for better cold-weather cranking, IMHO :D