What Kind of Oil do you use? (fuel, mileage, engines)

[87vertgt]

Synthetic

Regular

What ever is on sale

What ever the Jiffy Lube use's

[87vertgt]

Synthetic....expensive.....but it rides smoother and cooler....

[trlhiker]

I use Mobil 5000 and change my oil between 3 and 4 thousand miles.

[M3 Mitch]

The M3 and the 'rocco get Redline, it's expensive but it's good stuff. Seems to help cold-weather starting a lot, on the 'rocco.

If you do the math, you are spending something like 20 to 50 times more money on fuel than on engine lube oil - so for an individual owner, as opposed to a fleet manager, there isn't enough money to be saved to make going to something cheaper worthwhile, IMHO.

Then again, I don't have any specific data to prove the synthetic is doing anything that a cheaper conventional oil might do just as well.

It comes down to the film - if the film holds up and metal to metal contact does not occur, then the oil did all it came to town to do, so to speak.

[87vertgt]

friction is the name of the game.....

I also use Lucas oil additive...works like a sob!

[EarthBound?]

AMSOIL, needs only to be changed every 25,000 miles and I get great gas milage.

[Filet Mignon]

I use either full synthetic, or synthetic blend.

Based on the research I've done, I don't believe that full synthetic lubricates any better. However, based on nearly 20 years in Minnesota, I found out that synthetic does turn over easier in extreme cold.

[ferretkona]

I have been using Mobil One (full synthetic) or the last 15 years. Before that I used Castrol GTX.
I find that synthetic oils do not capture blow by gases that destroy it. Synthetic oils also run cooler temperatures - better mileage and motor longevity.

[rlrl]

40 oil for engines with 75,000 or more miles

[cdelena]

In the sportscar with a high revving engine I use the cheapest full synthetic available... currently Valvolene.

For the family car the cheapest premium oil on sale... currently Quaker State.

Both changed once a year regardless of miles driven.