770 gas engine oil type?

10W30 will work fine in a 770 used for general type work. If you are working it hard in the summer you may want to use 30 weight. I don't have my manual here, but I am quite sure the manual recommends 30 weight for summer and 10 weight for winter. I am not sure if the 10W30 was mentioned in the manual or not. One thing to remember is that this tractor was built before multi-viscosity oils were as good as they are today, which is one reason the 10W30 may not have been mentioned. I use 10W30 in my 770.
You should also use detergent oil, however as pointed out by others if non-detergent oil has been used there may be a build up of sludge etc. It would be good to check and to change the oil and filter often at the start.
Hope this is of some help.
Don

I DID answer his question, and it is the RIGHT answer, and it is the ONLY RIGHT answer.

I would not expect you to understand that but I'm sure the other folks do.

Maybe you can trying doing something useful... go out and help the dogs put the hens up for the night.

You have never contributed anything to this board except personal attacks. Make yourself useful and help Scott put those hens up.

I really don't see where you get off pretending to be some type of discussion board critic. Whether you like my answers or not does not matter to me one bit. If you need to boost your ego, play your passive/aggressive games with your family and friends.

Myron and Jerry are 100% correct. There is another side to this though. If you decide to use non-detergent when the engine requires detergent, the sludge that is created will not be filtered and this will severely shorten engine life. The entire purpose of detergent oils is to hold sludge in suspension so that it is delivered to the full-flow filter to be removed.

I said nothing abut the type of oiling system on a 770. I told him, just like I'll tell you, to read the manual. What I did do was give him an example. I did not recommend any type of oil.

Now, please go away.

The S-series service classification emphasizes oil properties critical to gasoline or propane fueled engines. If an oil passes a series of tests in specific engines (API Sequence tests), the oil can be sold bearing the applicable API service classification.

There are ten S-series classifications: SA, SB, SC, SD, SE, SF, SG, SH, SJ, and SL The S-series classifications progress alphabetically as the level of lubricant performance increases. Each classification replaces those before it, with SL currently offering the most protection. SL oil may be used in any engine, unless the engine manufacturer specifies a "non-detergent" oil.

SA and SB are nondetergent oils and are not recommended for use unless specified. SC oils were required for new car warranties from 1964 to 1967. SD oils were required from 1968 to 1970 and a few in 1971. Some new car warranties required SE oils in 1971 and its use continued through 1979. New car warranties from 1980 to 1989 require SF oils. New car warranties from 1990 to 1993 require SG oils.

New car warranties beginning with the 1994 model year require oils with an API SH performance rating. New car warranties beginning with 1997 require an API SJ oil. The year 2001 brought the introduction of SL oils. SL oils are designed to increase fuel economy, reduce emissions and protect hot, hard-working engines over the course of a very long warranty period.

C-series classifications deal with diesel engines. There are eight classifications: CA, CB, CC, CD, CD-II, CE, CF-4 and CG-4. CH-4, CA, CB, CC and CD performance rated oils are no longer used in diesel engines. However, oils used in turbocharged gasoline engines retain CF as part of their performance designation: SH, CF.

Unlike S-series classifications, C-series classifications do not supersede one another. The current classifications, CF, CF-2 and CH-4, are specified for various applications.

CF for Indirect Injected Diesel Engine Service. Service Category CF denotes service typical of indirect injected diesel engines and other diesel engines which use a broad range of diesel fuels in off-road applications, including diesel fuel with greater than 0.5 percent sulfur by weight. CF oils may be used in place of CD oils.

CF-2 for Two-Stroke Diesel Engine Service. Service Category CF-2 denotes service typical of two-stroke engines requiring highly effective control over cylinder and ring-face scuffing and deposits. CF- 2 oils may be used in engines for which CD-II oils are recommended.

CH-4 for Severe Duty Diesel Engine Service. Service Category CG-4 denotes service typical of high speed four-stroke diesel engines used in heavy-duty on- and off-highway applications. CH-4 oils are especially effective in engines designed to meet 1998 exhaust emission standards. CH-4 oils may be used in place of CD, CE, CF-4 and CG-4 oils.

The SAE and API classification systems are intended to help motorists choose the right oil for their needs. The choice depends on the engine, the outdoor temperature and the type of driving the motorist does most. Most motorists are more familiar with the SAE Viscosity Grade system than they are with the API Class system.

SJ is the current API class. SJ oils are widely available and most gasoline engine automobiles either specify SJ oil or, if they were manufactured before the SJ class was created, may use SJ oil. However, one should be sure to purchase SJ class oil for the best engine protection available. Of course, motorists should follow the oil specification of their vehicle owner�s manual

Or, for the mentally challanged like you, they are always upward compatible (gas engines only).

Go help your dumb buddy put the hens up.

Until you determine what weight oil is needed, I'd think you would be safe with a good 10W-30 for the short term. For what I know.
Myron KY

When in doubt as to what to run as far as oil goes, you can do yourself and your tractor a favor by removing the oil pan and the valve cover and cleaning away all the gum and sludge. Then when filling the crankcase with oil you can use a good grade of detergent oil.

Failing to clean atleast the pan out, you run the risk of the detergent oil disolving the dirt and then running it through the system. The oil filter will catch part of the contaminants but not enough to prevent damage over a period of time.

This is the technique I use when bringing an old Oliver back to life and it works just fine. I run 20w-50 oil in these old engines as I figure they could use a little extra protection.