Pennzoil Platinum 5W-30. I change my oil filter 3x more often than I change my oil. ;)

I wonder why people put synthetic in their cars...
Synthetic oils were used mostly only in airliners to keep the oil from freezing in the frigid temperature they mostly fly in. Spoken to a few other mechanics about using synthetic oils, and they mostly all have said "Why pay double for overkill..."

Not bagging on anyone, just wondering why pay 14$ a quart for oil...

I ran 0W-20 Royal Purple engine oil in my former 87 7MGTE. I had not experienced any significant loss of pressure, and in turn had a cooler, better performing engine. I switched from 5W-30 Mobil Clean 5000 conventional oil.

My reasonings for switching:

1: Extended oil life and better protection because a Synthetic oil's structure does not break down from normal use
2: Ability to reach thinner viscosity at startup, therefore providing better flow and lubrication for the engine during a traditionally high-wear period
3: *Most* Synthetic oils have been proven to adhere better to metal surfaces versus a mineral-based conventional oil, once again providing better lubrication (people may argue this point, as I have no data at hand to prove this; it's just something I've read a couple of times over the years)
4: Increased lubrication results in less friction. My engine now runs smoother, quieter, and is much more responsive vs. conventional oils I have run in my Supra.

With that said, there is a lot of bad information about what oil to run, how different oils work, and what's best for what scenario. Most people will believe what they believe for their own reasons, the only way to know for sure is EXTENSIVE research and experimentation.

I'm with BT.... hell, the only reason conventional oils are able to provide even half the wear and thermal characteristics its because of all the synthetic additives and unnatural altercation they put it through. you really can't get the goodol' oil you used to... and for a good reason, comparatively it sucked! ;)

lol so true theres alot of additives in standard oil now.

so common consensus besides the royal purple. 10w30? 40? 5w50?
if i were to buy a supra tomorrow. what oil would I use.

I would also say 0W-30 is acceptable

Ive been running 5W-30 redline synthetic oil, Bes oil in the buisness ;)

Have to order it from summit though have not found locally

Vavle train noise decreased drastically. MPG increased by 2 and on top of all the my rear main seal leak nearly completly vanished

http://www.supramania.com/forums/for...amp-Filtration

If you want more info on why its the best check out what jdub and others have to say about it.

Impressive
 

Thats quite an impressive report there cause a lot of us have valve train noise. I am going to have to check that out. Do you run the same oil in Winter and Summer? Thanks, Scott

Here is some info on it. Its 8.75 a bottle on ebay.

Do you guys use the same type of oil at a fresh rebuild?

or do you use a certain wt at during break in?