high mileage vs synthetic oil

[VCrossfan]

My 2 cents is that oil makers are wanting to cover every field they can, since cars are lasting longer than from the 70's/early 80's there marketing High Mileage, Heavy use, Higher RPM's, SUV, Light Truck, Heavy Truck etc... Is there much or any difference I don't know...But as we all know the oil companies can do and say anything they want with minimal regulations from the government... I'm at 152k miles and have used Mobil1 for the last 70k and I don't see myself ever changing brands/types. 5w-30 Winter and 15w-50 in the summer. They do make a High Mileage 10w-30 and 10w-40

http://www.mobiloil.com/USA-English/...s/Mobil_1.aspx

[Mark B]

I use high mileage GTX 10w 30 in my Isuzu Amigo which has 115,000 miles.
I switched from Mobile 1 at around 80,000.
I don't know if it helps. I don't see any difference.
But advertising works. It makes you think that you are doing something special for your vehicle.

[CoastieCosta567]

i use 10w-40 high milage oil and works great, the diffrence i have seen sence starting to use it for the past 2 years is i have seen better milage, not much but a little better, and most noticeable is the burning of the oil, it does not burn as much thats it, and i got a oil gasket cracked before on the oil pan when i hit a rock and it starting leacking through and thats when i chanced to 10w-40 high milage and what i saw also it stop leaking, so i guess it's thicker as well. but i have been thinking if i should change to full synthetic soon, to see if i see a diffrence.

[Marlin]

Not sure what the PO used, but I use Quaker State 4x4 Torque synthetic. It is a bit cheaper than the Castrol synthetic, but I use it in both my toys. Another good question, how about oil filters, I personally use the FRAM tough filter, but I am gonna guess that they are all about the same.
Speaking of maintenance, I replaced my fuel filter today, I swear it runs better and better throttle response. I am pretty sure it was the original filter at 117K miles.
My fuel pressure regulator will be here tuesday. Cleaned the TPS, which wasn't really all that dirty. New dielectric grease in most of the connections under the hood.
All in all, as far as oil, I think that as long as you do it regularly and use the appropriate weight for your weather, they probably all work out the same. (I am still gonna run synthetic)

[Gussie2000]

Not sure what the PO used, but I use Quaker State 4x4 Torque synthetic. It is a bit cheaper than the Castrol synthetic, but I use it in both my toys. Another good question, how about oil filters, I personally use the FRAM tough filter, but I am gonna guess that they are all about the same.
Speaking of maintenance, I replaced my fuel filter today, I swear it runs better and better throttle response. I am pretty sure it was the original filter at 117K miles.
My fuel pressure regulator will be here tuesday. Cleaned the TPS, which wasn't really all that dirty. New dielectric grease in most of the connections under the hood.
All in all, as far as oil, I think that as long as you do it regularly and use the appropriate weight for your weather, they probably all work out the same. (I am still gonna run synthetic)

That oil seems to be good quality though,i consider this # 1 on my list if mobil 1 ever ran out of stock.

[BigSwede]

80K isn't high mileage, at least not in my book. I use Mobil One in my Trooper, 128K miles, doesn't burn any oil so no reason to change.

[twistedsymphony]

if you have a formula that works, then there is no reason to change.

you might see some detrimental effects switching from regular oil to synthetic on higher mileage vehicles because sludge builds up around the gaskets and in crevices with regular oil and synthetic will clear that out, and while that might sound like a good thing, consider that the build up also keeps those areas from seeping oil...

I've had more than one car that started burning and leaking oil after switching to synthetic.

some older sensors have problems with synthetic oil as well and the synthetics can gum them up... I have a friend who is a Subaru Technician, apparently the owners manuals stated to NOT used ANY synthetics in their motors, and there are only certain tested brands that they'll let you use without voiding your warranty.

synthetics are nice sometimes but it's not a clear cut better oil than the regular stuff.

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as for filters, they're much more important than the oil you use... every mechanic and oil filter comparison I've seen has revealed 2 things

1. there are really only 4-5 filter manufacturers and most companies buy one of those and re brand it, (though there are sometimes subtle differences)
2. 90% of the filters out there are COMPLETE GARBAGE

kind of old but here is some good info on picking the right oil filter:
http://www.knizefamily.net/minimopar...ers/index.html

I use either K&N, Mobile 1 or Purolator in my cars, depending on which one I can get cheaper (they all have the same manufacturer). though the best filter you can get is made by "WIX" who make filters for most OEMs as well as the generic NAPA band.

FRAM is down right horrible, you'd be better off stuffing cheesecloth in a can.