Oil

[jaypullen]

Hello I have a 1977 mci5 with a 6v71 Im having a hard time figuring out what over the counter oil I should run Im running rotilla 15/40 I think its to light The bus has low miles 290,500 and runs great Any help out there Thanks JPULLEN

[Len Silva]

Definitely NOT 15/40.  You need a single weight CF-2 oil such as Rotella-T 40W or Chevron Delo-100 (NOT 400).

They are getting harder to find but NAPA is a good source.

[jaypullen]

Thanks ill check napa today JPULLEN

[jaypullen]

Thanks again for the info on the oil I got 55 gallons of the delo100 It may sound weird but the bus seems to have more power now and im not jokin Thank you www.jasonpullenstunts.com

[Slow Rider]

Jay, for us older and slower folks could you help us out on your poll?  What are the major differences between oil and oil ?    Or am I or perhaps the poll just missing something?

Frank

[NewbeeMC9]

I guess it was top oil vs bottom oil.  and Top Oil is narrowly preferred.




Possibly an exercise in Glass Half Full or Half Empty.   

[buddydawg]

I just did an oil change today and when I was at the distributor I had to choose and I chose oil over oil.  It was a tough decision to make but none the less I did it without gnashing teeth.  Oil it was (40wt no doubt).   

[Geoff]

Sorry, guys-- if you can't find CF-2 40 weight, 15w-40 is your next best oil.  I don't hestitate to run it in my bus with a 6V92TA 350 HP.

[JohnEd]

Geoff,

You are wrong.  If you can't get that CF2 in 40 wt get synthetic.  The carbon level in fresh oil is .98 and DD says the limit is 1 (ppm?)  So you should change it after a week on those grounds.  Synthetic starts of at ZERO parts carbon and ZERO parts sulphur and ZERO parts ash.  Lubes better too.  Check the oil analyiss at change intervals and I have heard that the stuff goes 5 times as long before needing changed and then you need to renew the additives. It costs twice as much...maybe a little more.  Any questions?  You need to verify all this stuff cause it comes from fleet truckers and engineers and oil salespeople and other experts and you know how they always agree.

NOT 15 W 40!  Not rec by any expert I have heard.

Not too blunt....right?

John

[kyle4501]

A 2 stroke places a different loading on the oil since EVERY stroke is a power stroke.
The proof is in the pudding - 2 strokes smoke less, use less oil, & last longer with the correct straight 40wt (30wt if cold climate).

There is a reason the manufacturer went to the trouble to specify what oil to use. 

[Geoff]

Last time I checked, DD also did not recommend syntheic oils.  If the proof is in the pudding, then using 15w-40 is fine because fleets have been using it for years in 2-strokes when they can't be bothered with stocking more than one oil for different engines.  The only drawbacks to using 15w-40 is possibly more oil leaks due to the thiner oil, and (according to DD), more ash buildup on the pistons.  I never have said that 15w-40 is better than CF-2 straiaght 40, but it does work just fine.  Considering CF-2 40 weight is getting harder and harder to find and they get premium prices for it, 15w-40 will work just fine and I've been saying that for 20 years.

--Geoff

[luvrbus]

Welcome back Geoff get ready the next thing coming at you will be the BS from Charlies Tejas web site LOL

good luck

[PSmith]

Just changed my oil and was able to get CF-2 - Rotella T -40W from NAPA.  The guy there is very helpful and went the extra mile to get it for me.  He gathered up 9-gals for me and called me when it was ready at the store.  He's got my future business.

[belfert]

Welcome back Geoff get ready the next thing coming at you will be the BS from Charlies Tejas web site LOL

Clifford, do you use 15W-40 oil in your Detroit 2 stroke engines?

[luvrbus]

Nope Belfert, but I don't have any problems with people that do I have a friend in Mesa that runs 15/40 in his buses in the transmission and the 6v92 never saw a 6v92 fail for him because of 15/40 but they will use more 15/40 than the 40W.
I don't think 15/40 is a good idea for 71 series as the oils cools the pistons on that series the 92 series are a little different on the cooling



good luck