Oil question

Hmm ok my car has a problem consuming oil it's ran 10w30 for most of it's life since i had it at 89k not sure when the previous owners ran on it but i heard somewhere to use 10w40 instead of 30 to ease consumption. What i wanna know is it safe to run 10w40 in the 4.6? I know this guy i work with runs it in his 98 f-150 and he said he hasnt had problems with it. Dont wanna take the chance of messing up my motor.

I talked to a ford rep who works at the Romeo plant, he says that you can run mulit grade oil up to 10w40 for long periods of time with no problems. As long as the oil is regulary changed, that is. Dirty oil is the only thing that kills these motors.

I guess that working at a L-M dealership has its benefits.

hey man thanks for the info i'm gonna run castrol gtx 10w40 for awhile and see how it goes

i run quaker state 10w30 in my mgm which would concume tons of oil and scence ive ran this oil ive had a massive decrease in oil consumption but you can run the 10w40 in her my dad who previously owned my mgm ran 10w40 in it with no problems so what ever you deside is up to you but i would highly recomend runnin the quaker state 10w30 thats my:2cents:

i run quaker state 10w30 in my mgm which would concume tons of oil and scence ive ran this oil ive had a massive decrease in oil consumption but you can run the 10w40 in her my dad who previously owned my mgm ran 10w40 in it with no problems so what ever you deside is up to you but i would highly recomend runnin the quaker state 10w30 thats my:2cents:

F.Y.I. A FRIEND OF MINE IS CURRENTLY RUNNING 20W50 IN HIS TRUCK EVERY SUMMER FOR THE LAST 4 YEARS AND HAS NEVER HAD A PROBLEM. THIS OIL IS ACTUALLY FOR DIESEL ENGINES BUT CAN BE USED IF THE WEATHER IS WARM ENOUGH. HE HAD THE SAME PROBLEM, IT DEFINATELY SLOWED THE PROBLEM DOWN. SO TO SUM UP, DON'T WORRY ABOUT USING 10W40 IT SHOULDN'T CAUSE ANY PROBLEMS, BUT BE CAREFUL IF THE WEATHER DROPS TOO LOW BELOW FREEZING. HOPE THIS HELPS.

PAUL
ON, CANADA:wink:

i run quaker state 10w30 in my mgm which would concume tons of oil and scence ive ran this oil ive had a massive decrease in oil consumption but you can run the 10w40 in her my dad who previously owned my mgm ran 10w40 in it with no problems so what ever you deside is up to you but i would highly recomend runnin the quaker state 10w30 thats my:2cents:

Well maincity i live here in south texas which doesnt freeze all that often kinda rare actually. lately it's been about 85f and up. And cobra dude nice grand marquis dont see many like that most of them are beat up and the paint is burned. Uncle had a 92 mgm but the tranny flopped :( so he sold it i was so close to buying it.

thanks alot thats what many people who like these cars say but if i was you thats what i would run i love the oil i would go through a quart a week it was so bad but no its down to a month and it keeps geting better but scence you down in texas the 20w50 should be ok but the oil passages are small so it your choice and good luck the best way to fix the problem would be to fix the valve stem seals but thats a big job but good luck

I thought about fixing the valve seals but i dont have the time lol maybe during the summer i'll get started on it. Just looking at the examples makes me ask myself do i wanna do it? Ha ha But the next project for me is suspension conversion :S

Hi guys! First of all, I just want to say that using any oil with an SAE rating from 5 to 50, either single grade or multigrade, will not damage your engine under normal operating conditions. Now that I have said that, let me give you a little education on oil viscosity.

When comes to the viscosity of motor oil, about all that most people understand is that the higher the number, the thicker the oil. Now this is true, but there is more to it than that. I learned quite a bit more about viscosity when I studied mechanical engineering in college.

Viscosity is a measure of internal frictional resistance of a fluid. Every fluid on earth has its own viscosity characteristics. In addition, the absolute viscosity of any fluid decreases with a rise in temperature. In other words, the warmer a fluid becomes, the thinner it becomes.

Years ago, the Society of Automotive Engineers (SAE) developed a specific set of standards for the viscosity of lubricating oils, called the SAE viscosity rating. The SAE viscosity rating can vary from 0 to 150. The fluid with any specific SAE viscosity rating has a specific absolute viscosity that varies consistently on a logarithmic scale over a specific range of temperatures.

One interesting characteristic is that the absolute viscosity of one grade of oil at one specific temperature can be the same as another grade of oil another specific temperature. For example, SAE 50 oil at 200F has the same absolute viscosity as SAE 40 oil at 175F, SAE 30 oil at 160F, SAE 20 oil at 145F, and SAE 10 oil at 115F.

Now, multigrade oils are different from single grade oils. These oils do not thin out as much over a range of temperatures as a single grade oil. The SAE viscosity rating uses two numbers. The first number in the rating of a multigrade oil indicates that the oil has the same absolute viscosity as the single grade oil of the same number at ambient temperature. The second number in the rating indicates that the oil has the same absolute viscosity as the single grade oil of the same number at operating temperature. For example, let us look at SAE 5W-30 motor oil. SAE 5W-30 oil has the same absolute viscosity as SAE 5 oil at 50F. It also has the same absolute viscosity as SAE 30 oil at 190F. Now let me explain this in simpler terms. If you put SAE 5W-30 oil in your engine, this oil will be like having SAE 5 oil in your engine when you start it up on a cold morning. Once the engine warms up to operating temperature, this oil will be like having SAE 30 oil in your engine.

The only benefit you get by using a multi-grade oil (say 10W-30) over a single-grade oil (say SAE 30) is lower flow resistance at start up. Once the engine warms up, there is no difference between the high number of the multigrade and the equivalent single grade.

If you are looking to decrease oil consumption with your selection of oil, I suggest using the 20W-50, because it will be thicker and less prone leaking past the rings or down the valve guides at operating temperature than either 10W-40 or 10W-30. Also, if you tend push the limits of your cars engine, like driving continuously at 4,500 rpm, your engine will produce more heat, raising the operating tempeature of your oil. In this situation, 20W-50 will provide better engine protection than 10W-30.

Right now I have my father's 1997 Town Car and I'm going to change the oil in it for him. The manual recommends using 5W-30. The last time I bought oil, there was a greater selection of 10W-30 motor oils on the shelf than 5W-30. I am going to buy either 5W-30 or 10W-30, whatever brand that costs the least, but still has has all the proper specifications listed on the bottle.

now some good usefully info thanks

Man i felt like i got schooled lol.

hI ALL, just got on board, and i could not resist this thread. i just sold an 85 merc grand marquis with 238,000 on the orig motor. always ran walmart "tech" 10 w 30 full synthetic. bought a 95 lincoln town car recently and just switched it over from ? to TECH. the linc has 73000 on it now and i just installed bosh +4 plugs in it. used every wrench and socket i own to get them in and had to pull the fuel rail anyway. computer says 24.3 ave mpg with the tech, but i know it is better than that as i put 235-75 x 15's all round and they are 7% bigger in diameter. so... 24.3 x 107% =26.0 mpg. mike

Man 24.3 that's pretty good i wish mine displayed that but right now it's only displaying 18.1avg that's because i'm using Autolite platinums and 10w-40 castrol. Yeah the sparkplugs are hard to change on these cars i wonder why my avg mpg is so low?

Yeah and i only have 215's i was gonna put 225's but the tire place said they didnt wanna put tires bigger than recomended because they wouldnt live up to their warranty so i said ok just put 215's