I have the absolute perfect example of the difference between synthetic and petroleum motor oil. I used to run Castrol 20W-50 in my Mustang. My operating temp idle oil pressure would be 35lbs. After a 10 second blast down the quarter the idle pressure would drop to 20-25lbs and slowly increase back to 35lbs as the oil cooled. This has more to do with the viscosity breakdown than the motor getting hot since the motor rarely strays beyond 190 degrees.

I then started running Mobile-1 10W-30. Same conditions, my idle oil pressure is 30lbs (due to the lighter viscosity). After a 10 second pass, the idle oil pressure is STILL 30lbs !!!!!!!!!! No significant breakdown in viscosity. Of course this sort of extreme abuse would not be seen on the street under normal conditions.

 

UberDude,

Pennziol-Quaker State is the WORST oil. But keep using it, so when and if your truck needs any head work and the dealership takes off the valve covers to reveal that everything is sludged up. I am sure they will get a good laugh.

I am here saying stop using it to help you. But for some reason you seem very firm on your reasoning to purchase *****ty oil.


Negative ghost rider, the pattern is full.

 

i use either mobile 1 or castrole sntec both are full synthetic oil and i change my oil every 3000 miles. that is a lot i realize that but i rather always have clean oil then let it get really dirty then change it. i dont care what oil u use amzoil in cluded if u let it go 7 or 10 or 12 thousand miles that oil is filthy by that point it might not be broken down yet but it sure as hell ids dirty as hell and that is just as bad for your engine as broken down oil. i have read in this forum that people use regular oild and let it go 5K miles i am astonished at the stupidity of doing that, regular oil is to be changed every 3000 or 3 months what ever comes first and even then it is about had it.

 

I hate to say it, but your truck is going to be a piece before the motor lets go because of oil failure related issues. . regardless I still use synthetic.

Case and point. 2002 F-250 with the 5.4L, work truck, with 170,000 miles. Dino oil, whatever filter but usually a Motorcraft and oil intervals of 5,000 miles. The truck was used on construction sites, pulling a trailor almost every one of those miles with no problems, we beat that truck to death. No problems since buying the truck, still going strong.

I use Mobil 1, fully synthetic. I used to use the Castrol Syntec but read that its not a 'true' FULL synthetic. I've been running 5,000-7,500 mile intervals since my first vehicle with NO problems what so ever. . and my first vehicle had 135,000 miles on it with 30,000 miles while it was under my care. If BMW will tell you 10,000 miles on a full synthetic. Ford recommends SEMI-SYNTHETIC and recommends oil change intervals of 5,000 miles. I don't have a problem going 5,000-7,500 since my truck goes offroad.

Opinions are like ***holes, everyones got them.

PS: I've had my oil anaylzed by Blackstone with a oil interval of 7,500 miles in my 2004 F-150 which saw a lot more offroad abuse than this one will ever see. I don't have the paperwork anymore but they told me that it was still good, no contamination, this was using Castrol Syntec as well.

 

This is a good example of what we DON'T do on a daily basis as rms8 has stated. I also agree with Thump on the mileage. There is a very slim chance that we will see engine lubrication problems before 200K with regular maintenance.

 

I guess I should have stated that I run normal Valvoline or Castrol in my "regular" cars. Neither of them will ever see the extremes that the Mustang will. The point being made was the synthetic oil did not break down one bit under the most demanding tasks while the petroleum oil did, and by a large margin.

 

I'm not sure why?Maybe because synthetic is more slippery than dino oil but...My turbocharged cars get more oil pressure from dino oil than they do with synthetic oil.I used Mobil1 10-30 for several years but swapped over to 10-30 dino oil a couple years ago.After putting a new camshaft in the car I had to run dino oil to break the cam in.I noticed then that I got more oil pressure with dino oil so I never swapped back to synthetic.I change the oil frequently anyway because I drag race and am constantly tuning my boost and alky injection and if I get it rich the oil smells gassy and it can washdown the cylinders.As often as I change my oil synthetic was a waste of money.

 

I use whatever Ford has on tap, every 5,000 miles. No problems what so ever.

 

I too change my oil frequently during the driving season in my mustang. It sees at most 1500-2000 miles a summer. The oil gets changed each time to the track and the filter is cut open and inspected. Never noticed any difference between the conventional vs. synthetic in that respect, but given the very short intervals, I never expected to anyway. It is a proven fact that synthetic oil has better shear capability, better cling, and superior thermal breakdown. I have experienced this first had by the fact that after several trips down the quarter mile, the oil pressure changes little compared to conventional oil. Synthetic by design is less prone to breakdown, and does not need the quantity of additives necessary to make conventional motor oil an "effective" oil.

I’m sure we could sit here and debate synthetic vs conventional all day long just like debating carbureted vs EFI on a race motor. All I’m stating is my first hand real world experience on the race track. My point was not that I got more pressure from synthetic, but that under severe load the synthetic did not break down one bit. Obviously my truck would never be subjected to those extremes; hence, I use conventional oil in it.


PS:Oops. Just realized how condescending that line may have come across. I didn’t mean to imply that my opinion was drawn from racing while yours was not. Sorry.

 

I'm not a racing man, so I will bow out now.

 

I've had 14 new vehicles (13 company paid) and none recommended 3,000 oil changes under normal conditions. Guess who came up with the 3,000 mile oil changes. It was the people who change oil! In my 59 years on this earth, I don't know of anybody anywhere that has had an oil related engine failure if the oil was changed as recommended by the manufacturer.

 

That was true in the past, but I've heard that the new Penz Platinum and Quaker State Q are fairly decent.

 

Didn't you say you were a dealer for Amsoil? Getting your opinion on oil is like getting a Chevy dealer's opinion on a Ford truck. You might be a bit biased!

Grim

 

No, that was f150newf.

 

do what u want but regular dino oil is shot by 3000 miles and besides that th oil is filthy i like clean oil in my engine, my first car wqas an 85 firebird i changed the oil every 2000 miles. when i sold it it had over 200,000 miles on it and was still going strong. the mechanic said they never ever saw a engine with 200,000 miles on it so clean. and with such good compression.