Is there that much of a difference?

I got some Royal Purple today and not having my manual with me, picked up 10w40. I really don't want to drive 30 miles back to the shop I goto to swap it out...(PAW)

Is the difference that much between the grades?

Ok to use this grade till the next change and then just get the 5w20?

It's been forever since I've done an oil change myself, having a luxury car you just take it somewhere.... but now that I'm getting back into cars, I still have a little stuff to relearn even at my age.

thanks

jake

 

With the tighter tolerences of the 4.6 modular motor you can do damage and void your warranty by not using 5w20

 

The 10w-40 is to thick and will not flow as well as 5w-20 which will result in more wear at start up since the oil will take longer to circulate. Also even when the motor is at operating temperature it will still be thicker and not flow as well...

 

it's kind of like the difference between water and honey

 

Do not use 10-40 unless it is an emergency. Such as stranded on side of road and need 2 quarts to get to help etc.

You can and will cause problems, may not show up immediatly, but in the long run, yes.

Swap it out for 5-20 as soon as possible.

TDS

 

Yeah, start-up is the key. 5W- 30 might be okay, but don't use 10W -anything.

 

gotcha..

I'll wait till next weekend to change the oil, it will give me a chance to run over and swap out the oil for the 5w20. I'm busy tomorrow and might not make it over to PAW.

thanks guys, makes sense.
jake

 

We have used 10w-30 in our Patrol Cars for at least 5 years and they go 160,000 miles plus with NO problems!!!!!!!!!!!!!!!!!

 

Are your patrol cars 2005-2007 Ford Mustang GT's with a 4.6L modular engine, I think not. The motor was not made to use 10w30. So do what ford and the owners manual tells you and use 5w20. Now if you have the V6 it does use 10w30 and thats what you should use.

 

The 3 valve engine came out in 2005 !!!

 

I went to PAW and changed to 5w20 this morning and changed my oil.

The factory oil wasn't super dirty but I know it still needed changed. No shavings that I could see in the oil.

Dropped the drain plug in the oil and had to fish it out with my hand... that oil was HOT HOT HOT!!!!

hahahahahah

thanks for the help. These new cars will take a little getting used to for maintinance...

you guys rock!

~jake

 

Not all cars are the same. I'm not a mechanic by any stretch, but even I know that...

You wouldn't try to run your car on kerosene, would you?

 

Oh, I forgot that 05 to 07 MUSTANG GT motors are extra special, hand crafted by God!! I am just a STUPID OLD Mustang owner with a 2000 model Mustang and I know I am not worthy of even posting unless I come out of the Dark Ages and buy a "New" Mustang. Correct me if I am wrong "engine experts", but isn't the 05-07 Mustang GT equipped with a MODULAR 4.6L that uses a short block that hasn't really changed since it was first introduced in the 1992 Crown Vic?? I never told anyone that they should use 10w-30 oil, just that I know for a fact it won't hurt your engine. Our Crown Victoria patrol cars have the same short block and they have run fine for years on 10w-30. My car and my Harley F 150 are suppose to use 5w-20, but I have run them for a few years on 10w-30 Mobil 1 and they run fine.

 

Well for your info the block isnt what we are worried about. Its the heads,crank,pistons,bearings, etc. THEY HAVE CLOSER TOLERENCES. That means that the metal is closer to metal. Which means you need a THINNER oil to get into those spaces! The block may have not changed much but the internals have.

SO DO SOME RESEARCH AND DONT BE A A$$HOLE

 

Who said anything about the block? I said "SHORT BLOCK". Do you even know what a "short block" is? Maybe you need to do some research. The short block is basically the block with with the crank, pistons and rods installed, and the modular motor started in 1992 with extremely close tolerences using powdered metal rods and pistons and has Ford has always recommended thinner oil! This doesn't mean that if you use 10w-30 instead of 5w-20 you are going to blow your engine. I would be careful about the name calling.

 

Hey, ya know what, let it go. The fact of the matter is, TacBear, that if you use 10W-30, which is not recommended by Ford, and something happens to the engine, it WILL NOT be covered under warranty. So, for all your good intentions may have been, what you said came across as advice, and it's probably not very sound advice.

If you want to run that risk to your engine, go for it. But don't prop yourself up as an expert and then give someone advice that could potentially cost them a warranty claim down the road. There are plenty of newbies on here that look up to the opinions of the "OLD mustang owners" like yourself. Be considerate of that fact.

Please, do not recommend someone violate the Ford recommendations when such a risk is involved. It's inconsiderate and irresponsible.

 

My last car was 30 years old when I sold it. It ran like new and never had any engine work done to it.
Maybe your cars will be fine in 30 years also, but why take a chance? What is your point? Should we all just ignore the recommendations?
What do you GAIN by not using the recommended weight?
I don't understand how you can say it is a fact no damage has been done because the vehicles still run after 160k miles. Did they tear down the engines or something? I had a car that ran fine after 90k miles and the original owner had never changed the oil (only added). Was no damage done? I don't know, I never tore down the engine.

 

Go back in my posts and show me where I RECOMMENDED anyone use a non recommended oil. I think all I said was if you were to put 10w-30 in your car it isn't going to hurt it. Just like if you use a NON Motorcraft oil filter your engine won't desinegrate either. I think anyone that has a car under warranty should use the recommended stuff just incase it has to go in for service. If everyone here is so worried about Ford finding out you are using 10w-30 instead of 5w-20 (which is very hard to detect), then I guess they are really worried about all those Mods on their cars. I have seen Ford void warranty's for aftermarket wheels, so I guess everyone here is stock.

 

1) NO we shouldn't ignore recommendations--at least under warranty.
2)What do I gain--I have alot of cars, trucks and boats they will all run fine on 10w-30 Mobil 1 which is easy to find (Walmart), I buy in bulk and 5w-20 is very hard to find. I also change the oil in my vehicles every 5000 miles no matter what is recommended because it is easy to keep up with.
3)Obviously there wasn't any damage if it was running fine.

 

by running 10w30 on a car made to use a different viscosity you put unneeded wear and tear on your engine especially during start up and especially in cold climates. Ive had cars in the past that needed 10w30 I never ran 20w50 in them and Ive also had a toyota with a factory turbo that need a 20w50 and I never ran 10w30 in it. They require a certain weight oil to run correctly. Running a thicker oil then needed will also decrease gas milage as it creates more drag.

The only time id recommend a thicker oil is if you had a old high milage car thats leaking oil pretty bad. As a thicker oil will have a harder time getting by seals.