laserredgt

ive been using full synthetic mobil 1 5w20 ever since the car has been with me and my brother...so i go into auto parts today and ask for 5w20 and the kid at the counter gives me this lecture about me having to go to 10w30 b/c my car was past 100k miles is this true? i dont think so but i just didnt want to look like a dumb *** if i did so please give me your imput..thanks guys

blackstallion666

your engine is built to run on 5w20. Just run the oil that you have always been using and change your oil when its time. Your engine is gonna be fine. If it was meant to run 10w30 at a 100k it would be in your owner's manual, and as long as i've been working on cars i've never heard of this being done.

ddmsgtr1

+1. There's a reason Ford puts 5w20 RIGHT ON THE CAP. Whether it be true or not, my mechanic told me to stick with 5w20 because it has something to do with the lubrication of the timing chains. But like i said, true or not, there's a reason that a manufacturer makes specifications, and unless a dealer or performance tech with the experience to make that call tells you different, just keep doing what you've been doing.

laserredgt

thanks guys... i got my 5 qts of mobil 1 5w20 and my k&n oil filter ready for tommorow

firehorse02

I understand you asking, but never listen to anyone at Kragen, Auto Zone or Advanced Auto. They are complete morons.

blackstallion666

+1 i hate walking into those places

laserredgt

bad thing is that i never asked him what i should use b/c i knew it was 5w20..hes the one that said i should change.

firehorse02

Yeah, I meant it's was good that you would come to this forum and ask. I didn't think you asked him. Sorry if I made it sound like that. Those guys always want to try and put in their two cents. It's like they think that just because they work at a Kragen they know what they're talking about. Even though if you just ask a simple question like "where is your oil located?" they have to ask what the make and model of the car is. I just tell them "I know what oil I need just point me to the damn oil." Is it a different isle based on the car I have? Morons, all of them. Sorry. That was my rant and rave for the day.

mikemc04gt

Unless you are using more than one qt. between drains, no reason to change weights.

RuffCat

I would never use 5w-20 in my engine because I am pretty rough on them. 5w-20 is on the cap and reccomended from Ford because of emissions plain and simple. A thinner weight oil does flow through tighter clearance passageways but lets face it, Ford's clearance tolerances suck ballz compared to GM and Dodge. EPA requires so much for a vehicle to leave the assembly line and that's why they do it. I would never go any thinner than a 10w-30 in warmer climates. Most of todays oils are multi vicosities which change in relative to heat. It's a 10weight oil w/viscosity of a 30 weight when heated up. You get the point. I wouldn't go so thick where youre oil pump is pumping more oil than is draining back down...lol Practically impossible with Ford pumps. You may lose 1-2hp going with a slightly thicker oil, but at higher rpms, the thicker oil will stick to moving parts alot better than the thinner stuff which gets tossed off like water.
As far as changing oil because you have hit the 100kmi mark. Congrats on hitting the mark with no catastrophies! Unless your burning, smoking, or plan on abusing the heck outta your car, then you you stick with what you have been using all along. Going with a thicker oil for higher mileage engines is merely a "bandaid" for worn and abused engines.
Synthetics themsleves lube better than conventional oil anyways. a 5w-20 Synth. is going to give better lubrication than 5w-20 reg oil. Just keep that in mind when deciding oil weights. The weight doesn't actually change from one to the next, just the lubrication does.