SAE Oil Question

[Tom Trujillo]

I am a little confused on the whole SAE oil specs. The owners manual on my '97 calls for CF4 15W40. I have always used Mobil 1 in my cars (not Delvac 1) with great results. Mobil 1 is only rated at CF. I was just on Amsoils website and their 3000 synthetic also only carries a CF2 rating, the other Amsoil diesel oils only carry a CF or CF2 ratings as well.



So, I guess my question is whats the difference and it would seem to me that none of the Amsoil products meet the specs?



What am I missing?

 

[SDBenton]

Look at the following link for more info on oil categories (the "S" for gasoline, "C" for diesel). http://www.api.org/programs_services/quality/oilchart.htm



In general, CH designation meets/supercedes any prior CF specification.

 

[HEMI®Dart]

tjtrujillo,



Our engine oils require the CF-4, SJ (Heavy Duty Diesel oil ) rating. Don't put anything not rated CF-4, SJ in the engine.



Diesel engine motor oil is a much tougher oil than gasser oil. The CF-4 spec has the additive package to combat the strong acids proudced in a Cummmins and hold soot in suspension untill the filer can get it, and a stronger detergent additive to combat the soot.



Also make sure your oil is CF-4 oil also has an SJ rating along with it. Our engines require the SJ rating because of the sliding camshaft tappets. 99% of the Heavy/Severe Duty Diesel Oils have both of the ratings.



Both types of Amsoil's Heavy Duty Diesel Oils have the CH-4, SJ ratings. Either one of these is an excellent choice.



15W-40 Synthetic Heavy Duty Diesel & Marine Motor Oil



5W-30 Series 3000 Heavy Duty Diesel Synthetic motor oil

 

[Tom Trujillo]

oil

Thanks guys. I thought the CH4 designation was something different. I did not realize that it supersceded CF's.



Tom

 

[HEMI®Dart]

tjtrujillo



When you get your pictures developed from the Milford Hooters meet, can you post them?. I think you are the only one who took pictures of all the trucks together when everybody was still there.



Thanks

 

[Tom Trujillo]

pic

I have not had any luck posting the pic.

 

[HEMI®Dart]

Email them to Tim "the tool man" Taylor. He'd know how to post them.