8V71 oil change

[centrix29]

Hi,

I have owned my 1980 Prevost for 2 years and I have yet to change the oil.  I am looking at putting straight 40 in instead of my 15w40 synthetic oil that is in right now.  Is this a good idea?  How much oil should I buy if I go straight 40?

Thanks!

Pat   

[Dreamscape]

I have changed mine, and also oil filter, and it took around 8 gals.

I just bought two cases for my trip. Good to have spares.

I also added Lucas Oil Treatment.

I use straight 40W as has been suggested.

Paul

Dreamscape

[bobofthenorth]

Straight 40 is what Detroit thinks we should run in our 2-strokes.  That's good enough for me.  It sticks in my head that my 8-92 takes just over 5 gallons but I may be wrong.

[steve5B]

 Hello,

  I have been told that Delo 100 works great in 8v-71s.  I have an 8v-92, and I use the same.

  Mine holds alittle over 6 gal. They say 15-40wt is only good in 4 strokes.  Like the ole saying is ''If it works, don't fix it"

  Steve 5B

[RJ]

Pat -

FYI, this topic comes up at least every six months or so on the message boards, and debate often rages.  Detroit's got more experience with these engines than anybody else, why is it that folk don't follow their recommendations?

Here's a link that you should print out and keep in your engine's maintenance manual, direct from "the horse's mouth":

http://www.detroitdiesel.com/support/on-highway/manuals/Lubricants_Fuels_Coolants/7se270.pdf

The section that pertains to the two-strokes is in section 2-2.

In a nutshell, you've been using the wrong oil, not an uncommon thing.  Especially since straight 40wt is not usually on the shelf at Wally World, it must be ordered.

Chevron Delo 100 and Shell Rotella T are two of the more common brands used, altho there are lots of others.  Easiest is to order from your local oil or petroleum distributor, located in your yellow pages.  Comes in gallon jugs, six jugs per case.  You'll need two cases, because the 8v71 takes seven gallons plus a smidgen more with a new filter.  You can also order it in five gallon pails and 55-gallon drums.

FWIW & HTH. . .

[beatsworkin]

 

    Phillips 66 super duty # 40 is also a good choice

[Athena]

Try your local Westmarine store - they carry 40W in Delo and Rotella

[Athena]

MCI techs are adamant about not using 15W40 on DD 2 stroke.
They sat it can damage your engine
Use only 40W on your 2 stroke DD
Fill the oil filter first then put oil into the engine
Mine took 7-8 gals including the oil filter (8V71)

[lvmci]

Summit racing will deliver to your house Mobil delvac 1240, best for least use, burn and leaking,  sometimes on sale! lvmci...

[chessie4905]

all we ever used after delvac 1140 was discontinued several years ago.

[luvrbus]

You guys went back 15 year for a oil topic lol that topic never will die

[Van]

You guys went back 15 year for a oil topic lol that topic never will die

C'mon aren't all oils the same? It's that time again Clifford lol!

[Tedsoldbus]

Yipee! Another 1980 Prevost. You seeing this Robert?
Still alive are 2 of my father in laws old FMCA buddies from back when FMCA was just buses. When I asked them the beloved oil question, they said "Straight 40 always, Rotella is the stuff"'. That is what was in it when I got it, so have just stayed with that. I get it at Tractor Supply because it is easy. I asked how often? "Once a year unless you drive over the Rockies or in lots of hot weather". They added that even if you drive it little, oil breaks down as soon as it is out of the jug. However, they have not had buses for 20 years. It seems there is good advice on a better oil from the sage veterans in this club still actively driving buses.
I am new, not a mechanic, and will acquiesce to the experts. But there is probably universal agreement: "Get that 15-40 out of your bus", Best of luck

[TomC]

15W-40 oil is actually 15 weight oil with polymers (chemical ball bearings) to make the engine think the oil is a 40 weight. But with 2 stroke engines these polymers get squished down and don't have time (like on a 4 stroke) to relax and jump back to original shape. So on a 2 stroke engine using 15W-40 when pulling a long hill you end up with a straight 15 weight engine oil which causes premature engine to the tune that a 500,000 mile engine might only last 100,000 miles. PLEASE use straight 40 weight. Good Luck, TomC

[dtcerrato]

Hey Tom - great description of the multi grade oil. Never heard it explained that way now it's clear as a bell!