Thread: Break in oil

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Originally Posted by Irelands child

Guys, I want to thank you for the responses. What it all boils down to, ya'all have about the same ideas and opinions that I have used for many years - use what the manufacturer would on a new engine (this is a SBF crate motor) and that is Motorcraft oil 5W-20 (I'll be using their 5W-30, I made a mistake in my first post). My intent is to tune the engine and run it a few miles 100 to 300, dump it refill with Motorcraft 10W-30 and run another 200 to 500 miles change again but to Mobil 1 10W-30 or 40 and run that forever.

I've had excellant luck with the Mobil 1 after trying Castrol and Valvoline synthetic oil in my '01 F150SCab w/5.4 and my wife's Escape. With the Castrol, a quart would "disappear" in 1000 miles or so. This happened 3 times in both vehicles. No problem with the Valvoline. I finally read some engineering reviews and Mobil was about equal to Amsoil - Castrol wasn't even in the running. With the Mobil 1 @ 5000 miles it is always down just about a pint. I wont pay the ridiculous price for a Mobil 1 filter though - has to be a Motorcraft or Purolator.

As far as emissions - I really don't care - it's a street rod with a carb, no cat on the exhaust and an a warmer camshaft to make sure the emissions stay high.

Zinc is one of the heavy metal nasties that are purported to to pollute the atmoshere along with lead, mercury, copper, nickel and cadmium and a few others.

A couple of web sites describing the deleterious effects of this crap(reading them might cause brain shutdown and a put you in a state of suspended animation called "sleep" ) :

http://www.fairfaxcounty.gov/nvswcd/...heavymetal.htm

http://drake.marin.k12.ca.us/stuwork...ct%20main.html

I would not be so quick to sell out the Castrol oil.
The reason it disappears I.M.O. is that is slicker than the other oil's and finds away out.
We have found this to be ture on almost all the synthetic oil's we have run.
That is why we don't every run a straight synthetic.

Originally Posted by DennyW

I run Castrol in the wifes car, and my motor cycle. Very good results. I use Havoline in my Merc engine. Stays clean as a whistle.

If you want some hands on experience from oil. I'll give you one. This is how ever a few years back. My previous brother-in- law had a Chevy pickup. He changed oil every 5,000 miles. He used the high dollar Mobile 1 oil. He was getting oil pressure errattic readings. He asked if I would take a look at it. I did. I pulled the valves covers. You have to remember now, he did a lot of starting and stopping, but did go on the road some times, which that may have been the reason, but I filled a McDonalds medium coke cup to the top from cleaning both heads around the valve train. It was like Goooy paste. It reminded me of the old Non Detergent oils, how they would build up. Except this had the gritty feel along with it. I had to pull the oil pan, and clean that, and the oil pump screen. He asked if he should switch oil, and I said no. All you will do is flush all that, and get troubles again. Soon after he traded it.

ps: From the ratings on their site.
Engine Oil
Castrol GTX
API* 5W-20 - Maximum Protection Against Viscosity and Thermal Breakdown

Product Data Sheet




Castrol SYNTEC
API* 5W-20 - Outperforms ALL Leading Motor Oils

Product Data Sheet




Castrol SYNTEC BLEND
API* 5W-20 - Added Protection for Frequent Short Trips

Denny,if your former brother in law had a lot of starting and stoping maybe the 5,000 was more like 7,500. In other words we could go by an hour meter instead of miles.

Originally Posted by DennyW

Well, even so, it said 10,000 mile oil change intervals then.

I feel that like STP, when you heat and cool things, your buildup also does the same thing. Just keeps adding layer after layer.

It is kind like engine insulation.

Originally Posted by erik erikson

I would not be so quick to sell out the Castrol oil.
The reason it disappears I.M.O. is that is slicker than the other oil's and finds away out.
We have found this to be ture on almost all the synthetic oil's we have run.
That is why we don't every run a straight synthetic.

Erik
Unless it's going out the tail pipe - I doubt it. This 5.4 and my earlier 4.6's are the cleanest engines I've ever had - NO leaks. Ever. If, based on my experience and IMHO, I want to change brands, it wont be back to Castrol .

Originally Posted by Irelands child

Erik
Unless it's going out the tail pipe - I doubt it. This 5.4 and my earlier 4.6's are the cleanest engines I've ever had - NO leaks. Ever. If, based on my experience and IMHO, I want to change brands, it wont be back to Castrol .

If it is not going out the pipes where can it be going?

Originally Posted by erik erikson

If it is not going out the pipes where can it be going?

Exactly - because there is no leak and if it goes out the tailpipe, it has to be breaking down, at least in my engines - and it has found a way out, but not a 'visible' way.

Originally Posted by Irelands child

Exactly - because there is no leak and if it goes out the tailpipe, it has to be breaking down, at least in my engines - and it has found a way out, but not a 'visible' way.

If the oil is going out the tailpipe has nothing to do with it "breaking down".

Originally Posted by erik erikson

If the oil is going out the tailpipe has nothing to do with it "breaking down".

I GIVE UP !!!

Originally Posted by Irelands child

I GIVE UP !!!

It is to early for that.

Originally Posted by erik erikson

If it is not going out the pipes where can it be going?

i ask the same thing about my socks when i goto take them out of the dryer

Originally Posted by thesals

i ask the same thing about my socks when i goto take them out of the dryer

That sounds like my wife.Two go in to the dryer one comes out.