hurt my truck. I using mobile1 syn.high milage oil.

 

is this a statement or a question?

 

I was wondering the same thing.

 

I did not even know they made a high mileage syn!

 

Neither did I. I knew they made a high mileage dino oil, but not a "high mileage" synthetic. You think he meant "extended performance?"

 

I guess they do:

http://www.mobiloil.com/USA-English/...ge_10W-30.aspx

 

I saw that stuff over at Advance Auto the other day. Only available in 10W30 and 10W40, and it doesn't meet either Ford 929 or 930 specs or GF-4. It's only SJ/CF.

 

This is a bullitin from Ford Motor when asked the same question before SAE 5W-20 was recommended.

Both SAE 10W-30 and SAE 5W-30 viscosity grade motor oils have been recommended in the past depending on vehicle model and model year.

Tests have proven SAE 5W-30 viscosity grade motor oil provides the optimum protection and benefits for Ford gasoline engines. At both high and low ambient temperature conditions, SAE 5W-30 provides the best overall protection. It allows faster starts under cold ambient temperatures.

SAE 5W-30 also provides approximately 1/2% increase in fuel economy over SAE 10W-30.

SAE 5W-30 viscosity grade motor oils certified for gasoline engines by the American Petroleum Institute (API) should be used for all service procedures requiring replacement of the motor oil.

 

I generally use 20W-50. I'll take some start-up wear for better protection in the Florida heat.

 

That old 302 of yours will run on anything. I sure wouldn't put anything thicker than 5W30 in a mod motor.

 

Sorry folks I was kind of a hurry. It was a question. I just switch to 10w-30 and from 5w-20. My truck has over 100,000 and just wondering if this will hurt my motor over the long run. Someone said it doesn't meet either Ford 929 or 930 specs or GF-4. It's only SJ/CF. (what does that mean.) I know enough to about my motor and can pretty much replace anything that breaks. But don't know the lingo.

 

I wouldn't worry too much about it then. My bud is using 10w40 Royal Purple in his and that truck has 120'ish thousand miles on it, maybe 130 something, I cannot remember. He went to the heavier wt. oil because he was using about a quart every 1500. So far he's very happy.

Why did you make the switch? Was there a problem with the 5w20?

 

Translating the lingo, it basically means that the oil does not meet factory specifications for your engine. This does not necessarily mean that it will hurt anything because it *IS* good oil.

I believe the 9xx and GF-4 specs are related to efficiency but the SJ/CF ratings are SAE specs. S ratings are for gas engines and C ratings are for diesels. The latest SAE gas engine rating is SM.

 

Will I took it to the dealer because there was a coupon in the mail for 19.95 for oil change add 10 bucks more for Synthetics oil. I using 5-20w and it was burning my oil pretty quick. I think it was 1 quart low anyway (he suggested) switch to heavier weight. My truck motor was fine and no major problem other the oxygen sensor need to be replace. That the reason for the change but sill keeping an eye on my oil level.

 

adding to this , what is the choice of oil and viscosity on this site? i am a new member and have an 05 5.4 bought it with 38k now has 41 and ready for my first oil change. since i bought the truck in may i have added a s&b intake,edge evolution, flowmaster,put a leveling kit on front and added 325 60 18 toyo ats i dont like the 5 20 oil seems to light but was looking for what others are running, thanks